user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: Which country with the calling code 855 was the Vietnam war located in? 
Knowledge Triplets: North Vietnam, military.military_combatant.military_conflicts, m.0g5dgz6
m.04yz37j, military.military_combatant_group.combatants, North Vietnam
Hanoi, base.biblioness.bibs_location.country, Vietnam
Adrift, film.film.country, Vietnam
South Vietnam, location.location.contains, Ap Lo Gom
Vietnam, location.location.time_zones, Indochina Time Zone
m.04z0df9, military.military_combatant_group.combatants, North Vietnam
Vietnam War, time.event.locations, South Vietnam
War in Vietnam, military.military_conflict.commanders, m.0dh5jv_
North Vietnam, location.location.events, Joint warfare in South Vietnam, 1963–69
South Vietnam, common.topic.notable_types, Country
North Vietnam, military.military_combatant.military_conflicts, m.09j4467
Vietnam War, common.topic.webpage, m.09xfyqk
m.04z1wm5, military.military_command.military_conflict, 1960 South Vietnamese coup attempt
m.05cnn5f, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04ftw28
South Vietnam, military.military_combatant.military_conflicts, m.04z0cm5
North Vietnam, location.location.events, Vietnam War
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Communism
Vietnam, location.country.capital, Hanoi
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0b78jlb
War in Vietnam, base.culturalevent.event.entity_involved, Communism
Vietnam War, common.topic.webpage, m.09w6kz6
m.09w6pvn, common.webpage.topic, Vietnam War
Vietnam War, common.topic.article, m.07_nr
South Vietnam, location.country.national_anthem, m.0gm710l
North Vietnam, location.location.people_born_here, Hanoi Hannah
Southeast Asia, location.location.contains, South Vietnam
Vietnam War, military.military_conflict.commanders, m.0w5r65c
Southeast Asia, location.location.events, First Indochina War
Laos, location.location.events, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.0bd34v7
m.0b797xy, military.military_combatant_group.combatants, North Vietnam
m.0b7915n, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
North Vietnam, military.military_combatant.military_conflicts, m.0ggd4zm
North Vietnam, military.military_combatant.military_conflicts, m.06wj2w6
North Vietnam, military.military_combatant.military_conflicts, m.04yw7ks
Vietnam War, common.topic.webpage, m.09wkmg9
m.04y_538, military.military_combatant_group.combatants, North Vietnam
m.04z0cm5, military.military_combatant_group.combatants, South Vietnam
Vietnam War, book.written_work.subjects, Southeast Asia
m.04z0g8_, military.military_combatant_group.combatants, North Vietnam
Vietnam, location.country.administrative_divisions, Quảng Ngãi Province
North Vietnam, military.military_combatant.military_conflicts, m.04z0g8_
South Vietnam, location.location.people_born_here, Hubert Vo
Vietnam, location.location.containedby, Asia
m.0b481t3, common.webpage.topic, Vietnam War
North Vietnam, location.country.official_language, Vietnamese Language
War in Vietnam (1954-1959), time.event.locations, South Vietnam
Vietnam War, common.topic.webpage, m.09y37g1
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Anti-communism
Vietnam, location.country.administrative_divisions, Quang Binh Province
m.0g5c716, military.military_combatant_group.combatants, North Vietnam
m.0b78bs8, military.military_combatant_group.conflict, Joint warfare in South Vietnam, 1963–69
m.05tbj5p, military.military_combatant_group.combatants, South Vietnam
m.09y37g1, common.webpage.topic, Vietnam War
m.0bd485_, military.military_combatant_group.combatants, North Vietnam
South Vietnam, military.military_combatant.military_conflicts, m.0b79c5w
m.09xgcz2, common.webpage.topic, Vietnam War
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, South Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Kingdom of Laos
North Vietnam, location.location.geolocation, m.0wmhy7k
Vietnam War, time.event.locations, Cambodia
m.04z0zb9, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.casualties, m.04kb4kx
North Vietnam, location.location.events, Vietnamization
Vietnam, location.location.partially_contains, Mekong
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Ho Chi Minh
North Vietnam, military.military_combatant.casualties, m.0c1qd3v
War in Vietnam, time.event.locations, North Vietnam
Vietnam, location.country.administrative_divisions, Quảng Trị Province
m.02h783h, military.force_strength.combatant, North Vietnam
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Viet Minh
Hanoi, location.location.containedby, Vietnam
North Vietnam, location.location.events, Battle of Haiphong Harbor
m.04yvh30, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.07llp3_
m.04y_651, military.military_combatant_group.combatants, South Vietnam
m.04kb4kx, military.casualties.combatant, North Vietnam
South Vietnam, location.country.currency_used, South Vietnamese đồng
North Vietnam, military.military_combatant.military_conflicts, m.05tbj5v
North Vietnam, military.military_combatant.casualties, m.0c1qd3l
South Vietnam, location.location.geolocation, m.09dx4xf
Vietnam War, common.topic.webpage, m.09wx9cc
Southeast Asia, book.book_subject.works, Vietnam War
m.04z083c, military.military_combatant_group.combatants, North Vietnam
m.0bd4cz8, military.military_combatant_group.combatants, North Vietnam
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78bs8
Southeast Asia, book.book_subject.works, Vietnam
Joint warfare in South Vietnam, 1963–69, time.event.locations, Laos
Vietnam War, time.event.locations, Cambodia
North Vietnam, military.military_combatant.military_conflicts, m.04zd3yf
m.0b79c5w, military.military_combatant_group.combatants, South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04y_qt6
North Vietnam, military.military_combatant.military_conflicts, m.04z0cm0
m.0b78jlb, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Kingdom of Laos
North Vietnam, location.location.events, Operation Linebacker
Vietnam War, base.culturalevent.event.entity_involved, Australia
Vietnam War, base.culturalevent.event.entity_involved, North Vietnam
m.0g5c27c, military.military_combatant_group.combatants, South Vietnam
Southeast Asia, location.location.events, Vietnam War
Vietnam Veterans Memorial, location.location.containedby, Washington, D.C.
m.04yzp99, military.military_combatant_group.combatants, North Vietnam
North Vietnam, location.country.form_of_government, Republic
m.04yw881, military.military_combatant_group.combatants, North Vietnam
m.09j4467, military.military_combatant_group.combatants, North Vietnam
m.0dh6jtq, military.military_command.military_conflict, War in Vietnam (1954-1959)
m.0c5n9pb, military.military_command.military_conflict, Joint warfare in South Vietnam, 1963–69
m.09w6kz6, common.webpage.topic, Vietnam War
m.09xtw5q, common.webpage.topic, Vietnam War
m.09wx9cc, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.04z35mt
North Vietnam, military.military_combatant.military_conflicts, m.05cldkd
South Vietnam, military.military_combatant.military_conflicts, m.04z0g94
War in Vietnam, base.culturalevent.event.entity_involved, Viet Cong
South Vietnam, common.topic.notable_for, g.125h4ls67
m.04z002c, military.military_combatant_group.combatants, North Vietnam
Vietnam War, military.military_conflict.commanders, m.0478plb
Joint warfare in South Vietnam, 1963–69, time.event.locations, South Vietnam
Vietnam War, common.topic.webpage, m.09xtw5q
m.05cnn5l, military.military_combatant_group.combatants, South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.05cl1dh
Vietnam War, common.topic.webpage, m.0b47hsk
North Vietnam, military.military_combatant.military_conflicts, m.04z15c1
Vietnam War, base.culturalevent.event.entity_involved, North Korea
Sino-Vietnamese War, base.culturalevent.event.entity_involved, Vietnam
m.04yx35t, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.03z979q
South Vietnam, location.location.people_born_here, David Pham
Vietnam, location.country.official_language, Vietnamese Language
Vietnam, base.locations.countries.continent, Asia
North Vietnam, military.military_combatant.military_conflicts, m.04y_6r1
War in Vietnam (1954-1959), time.event.locations, North Vietnam
Vietnam War, time.event.locations, Laos
War in Vietnam, time.event.locations, South Vietnam
South Vietnam, military.military_combatant.military_conflicts, m.04m2vg5
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Anti-communism
North Vietnam, military.military_combatant.military_conflicts, m.04z084z
m.09wmlvm, common.webpage.topic, Vietnam War
Vietnam War, book.written_work.subjects, United States of America
South Vietnam, military.military_combatant.military_commanders, m.0478plb
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Communism
North Vietnam, military.military_combatant.military_conflicts, m.04yz37j
m.05tbj5v, military.military_combatant_group.combatants, North Vietnam
Vietnam War, common.topic.image, Vietnamese village after an attack
Ho Chi Minh City, base.biblioness.bibs_location.country, Vietnam
North Vietnamese invasion of Laos, military.military_conflict.combatants, m.0dls8dn
Vietnam, location.country.form_of_government, Single-party state
m.09xfyqk, common.webpage.topic, Vietnam War
South Vietnam, military.military_combatant.casualties, m.02h77gp
North Vietnam, military.military_combatant.military_conflicts, m.04yx35t
South Vietnam, location.location.contains, Van Tuong
North Vietnam, military.military_combatant.military_conflicts, m.04z1mrp
Moratorium to End the War in Vietnam, common.topic.notable_for, g.1255b7mww
First Indochina War, base.culturalevent.event.entity_involved, Ho Chi Minh
m.03z96cp, military.military_combatant_group.combatants, South Vietnam
m.04kb4kj, military.casualties.combatant, South Vietnam
UH-1combatmission1970, common.image.appears_in_topic_gallery, Vietnam War
Indochina Wars, time.event.locations, Southeast Asia
Southeast Asia, location.location.contains, Provisional Revolutionary Government of the Republic of South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04y_64x
North Vietnam, location.location.events, Operation Pierce Arrow
North Vietnam, military.military_combatant.military_conflicts, m.04ftw4b
m.0g5cj73, military.military_combatant_group.conflict, North Vietnamese invasion of Laos
m.04z35mt, military.military_combatant_group.combatants, North Vietnam
Vietnam, location.country.administrative_divisions, Hanoi
South Vietnam, military.military_combatant.military_conflicts, m.03z9671
m.04ftx09, military.military_combatant_group.combatants, North Vietnam
South Vietnam, common.topic.article, m.0g8c4
North Vietnam, military.military_combatant.military_conflicts, m.0g5cwl3
m.02h77fs, military.casualties.combatant, South Vietnam
War in Vietnam (1954-1959), common.topic.notable_types, Military Conflict
m.0b78mbw, military.military_combatant_group.conflict, Joint warfare in South Vietnam, 1963–69
North Vietnam, military.military_combatant.military_conflicts, m.0bd31gj
North Vietnam, location.location.events, Operation Rolling Thunder
m.03z9671, military.military_combatant_group.combatants, South Vietnam
Vietnam, location.location.events, Sino-Vietnamese War
m.0b79163, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04ftqs2
North Vietnam, military.military_combatant.military_conflicts, m.0b798ys
War in Vietnam, base.culturalevent.event.entity_involved, Le Duan
Sino-Vietnamese War, time.event.locations, Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Cuba
South Vietnam, military.military_combatant.casualties, m.04kb4kj
War in Vietnam (1954-1959), time.event.included_in_event, Cold War
Vietnam War, common.topic.webpage, m.0b4887b
m.04z0cd1, military.military_combatant_group.combatants, North Vietnam
The Vertical Ray of the Sun, film.film.country, Vietnam
North Vietnam, location.location.events, War in Vietnam (1954-1959)
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78_7h
Vietnam War, base.culturalevent.event.entity_involved, Ho Chi Minh
Vietnam, location.location.events, Cold War
Asia, base.locations.continents.countries_within, Vietnam
m.09xwgxs, common.webpage.topic, Vietnam War
m.04z0853, military.military_combatant_group.combatants, South Vietnam
Vietnam War, military.military_conflict.commanders, m.02h77w4
South Vietnam, military.military_combatant.military_conflicts, m.09j4462
North Vietnam, military.military_combatant.military_conflicts, m.05cnn5f
m.02h77gp, military.casualties.combatant, South Vietnam
North Vietnamese invasion of Laos, time.event.included_in_event, Vietnam War
Vietnam, common.topic.notable_types, Country
North Vietnam, military.military_combatant.military_conflicts, m.05cnzgm
m.04z1097, military.military_combatant_group.combatants, North Vietnam
Vietnam, location.location.containedby, Eurasia
m.0w5r65c, military.military_command.military_conflict, Vietnam War
North Vietnam, military.military_combatant.casualties, m.04kb4l7
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0c5n9pb
South Vietnam, location.country.form_of_government, Republic
m.0g5cwl3, military.military_combatant_group.combatants, North Vietnam
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Thailand
Vietnam War, time.event.locations, North Vietnam
Vietnam War, time.event.locations, Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04yw881
m.09j4462, military.military_combatant_group.combatants, South Vietnam
m.07lm3yg, military.military_combatant_group.combatants, North Vietnam
Vietnam War, military.military_conflict.commanders, m.02h77tp
North Vietnam, military.military_combatant.military_conflicts, m.06482w8
South Vietnam, military.military_combatant.military_commanders, m.02h77tp
North Vietnam, military.military_combatant.military_conflicts, m.04yzp99
Location of Republic of South Vietnam, common.image.appears_in_topic_gallery, South Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z1097
m.0478plb, military.military_command.military_combatant, South Vietnam
Quảng Ngãi Province, location.administrative_division.country, Vietnam
Vietnam War, time.event.included_in_event, Indochina Wars
m.04ftw8j, military.military_combatant_group.combatants, North Vietnam
m.09xm1xv, common.webpage.topic, Vietnam War
War in Vietnam, base.culturalevent.event.entity_involved, South Vietnam
North Vietnam, location.location.events, Operation Chopper
Joint warfare in South Vietnam, 1963–69, common.topic.notable_types, Military Conflict
War in Vietnam, base.culturalevent.event.entity_involved, Anti-communism
m.0c1qd3l, military.casualties.combatant, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Pathet Lao
North Vietnam, military.military_combatant.casualties, m.04ml3lw
Vietnam War, base.culturalevent.event.entity_involved, Francoist Spain
North Vietnam, military.military_combatant.military_conflicts, m.04z002c
North Vietnam, military.military_combatant.military_commanders, m.0c1qcyn
War in Vietnam (1954-1959), military.military_conflict.commanders, m.0dh6jtq
South Vietnam, location.location.containedby, Southeast Asia
m.04yw7ks, military.military_combatant_group.combatants, North Vietnam
South Vietnam, military.military_combatant.military_conflicts, m.04z0853
Vietnam War, base.schemastaging.context_name.pronunciation, g.125_qxttj
Vietnam War, military.military_conflict.commanders, m.07skn34
Joint warfare in South Vietnam, 1963–69, military.military_conflict.combatants, m.0b78mbw
North Vietnam, military.military_combatant.military_conflicts, m.04yxsw9
South Vietnam, location.location.contains, Bình Ba
Quảng Trị Province, location.administrative_division.country, Vietnam
North Vietnam, common.topic.image, LocationNorthVietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Cao Văn Viên
North Vietnamese invasion of Laos, base.culturalevent.event.entity_involved, North Vietnam
North Vietnam, location.location.events, Operation End Sweep
Cambodia, location.location.events, Cambodian–Vietnamese War
m.0jmy703, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.07lm3yg
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Hoàng Văn Thái
Vietnam War, common.topic.webpage, m.09xgcz2
North Vietnam, military.military_combatant.military_conflicts, m.04fts61
South Vietnam, military.military_combatant.military_conflicts, m.04y_651
m.04z0cm0, military.military_combatant_group.combatants, North Vietnam
Cambodian–Vietnamese War, time.event.locations, Cambodia
m.03z979q, military.military_combatant_group.combatants, North Vietnam
First Indochina War, time.event.locations, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.0jmy703
South Vietnam, location.country.languages_spoken, French
War in Vietnam (1954-1959), time.event.included_in_event, Vietnam War
North Vietnam, common.topic.notable_types, Country
South Vietnam, location.location.contains, Gia Dinh
m.09w6h34, common.webpage.topic, Vietnam War
m.0gx8n8z, military.military_combatant_group.combatants, North Vietnam
North Vietnam, location.location.events, War in Vietnam
Vietnam War, common.topic.webpage, m.09wmlvm
South Vietnam, location.country.official_language, Vietnamese Language
North Vietnam, military.military_combatant.military_conflicts, m.04z0zb9
North Vietnam, military.military_combatant.military_conflicts, m.03z97td
m.04ml3lw, military.casualties.combatant, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.0bd4cz8
m.02h77tp, military.military_command.military_combatant, South Vietnam
Vietnam War, book.written_work.subjects, Asia
Hanoi, location.administrative_division.country, Vietnam
War in Vietnam, base.culturalevent.event.entity_involved, Ngo Dinh Diem
m.0b47hsk, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.0b797xy
First Indochina War, base.culturalevent.event.entity_involved, North Vietnam
m.04z15c1, military.military_combatant_group.combatants, North Vietnam
Vietnamization, time.event.locations, North Vietnam
South Vietnam, location.location.people_born_here, Jane Luu
m.04z0sqf, military.military_combatant_group.combatants, North Vietnam
m.0b4887b, common.webpage.topic, Vietnam War
North Vietnam, military.military_combatant.military_conflicts, m.0bd485_
North Vietnam, location.country.capital, Hanoi
m.06482w8, military.military_combatant_group.combatants, North Vietnam
m.09j3ckd, military.military_combatant_group.conflict, War in Vietnam (1954-1959)
Cambodia, location.location.events, Vietnam War
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Le Duan
m.06wj2w6, military.military_combatant_group.combatants, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z0df9
Vietnam, location.country.form_of_government, Socialist state
m.0wg12cd, location.mailing_address.country, South Vietnam
Vietnam War, military.military_conflict.combatants, m.03z9671
North Vietnam, military.military_combatant.military_conflicts, m.062v8cs
North Vietnam, military.military_combatant.military_conflicts, m.04ftx09
North Vietnam, military.military_combatant.military_conflicts, m.04ftw8j
Vietnam War, common.topic.webpage, m.0b481t3
War in Vietnam (1954-1959), base.culturalevent.event.entity_involved, Ngo Dinh Diem
Ho Chi Minh City, location.administrative_division.country, Vietnam
m.04m2vg5, military.military_combatant_group.combatants, South Vietnam
Vietnam War, base.culturalevent.event.entity_involved, Thailand
Laos, location.location.events, Joint warfare in South Vietnam, 1963–69
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, Vietnam
North Vietnam, location.location.events, Operation Ivory Coast
Vietnam War, common.topic.webpage, m.09xwgxs
Vietnam War, common.topic.webpage, m.09xm1xv
Vietnam War, base.culturalevent.event.entity_involved, Nguyễn Cao Kỳ
North Vietnam, military.military_combatant.military_conflicts, m.0g5c716
Vietnam War, common.topic.notable_for, g.1258vfs7z
North Vietnam, location.country.form_of_government, Single-party state
Vietnam War, base.culturalevent.event.entity_involved, China
Vietnam War, common.topic.webpage, m.09w6h34
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Viet Cong
Vietnam, location.country.administrative_divisions, Ho Chi Minh City
North Vietnam, location.location.events, First Indochina War
North Vietnam, military.military_combatant.military_conflicts, m.04z083c
North Vietnam, common.topic.article, m.0g979
Joint warfare in South Vietnam, 1963–69, time.event.locations, North Vietnam
m.04z084z, military.military_combatant_group.combatants, North Vietnam
Sino-Vietnamese War, base.culturalevent.event.entity_involved, China
Vietnam War, base.culturalevent.event.entity_involved, Taiwan
Mainland Southeast Asia, location.location.contains, Vietnam
Vietnam War, common.topic.webpage, m.09w6pvn
North Vietnam, location.location.events, Operation Linebacker II
Joint warfare in South Vietnam, 1963–69, military.military_conflict.commanders, m.0b7915n
North Vietnam, military.military_combatant.military_conflicts, m.04y_538
m.07slz04, military.military_combatant_group.combatants, North Vietnam
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Võ Nguyên Giáp
m.04ftqs2, military.military_combatant_group.combatants, North Vietnam
m.04z0g94, military.military_combatant_group.combatants, South Vietnam
South Vietnam, location.location.people_born_here, Andrew Lam
m.09wkmg9, common.webpage.topic, Vietnam War
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, William Westmoreland
Vietnam, location.location.containedby, Mainland Southeast Asia
South Vietnam, military.military_combatant.military_conflicts, m.05cnn5l
m.03z97td, military.military_combatant_group.combatants, North Vietnam
Indochina Wars, common.topic.notable_for, g.1s05l55p0
Joint warfare in South Vietnam, 1963–69, base.culturalevent.event.entity_involved, Nguyễn Văn Thiệu
North Vietnam, military.military_combatant.military_conflicts, m.04yvh30
Vietnam War, time.event.locations, Southeast Asia
North Vietnamese invasion of Laos, military.military_conflict.combatants, m.0g5cj73
First Indochina War, time.event.locations, Southeast Asia
Vietnam War, base.culturalevent.event.entity_involved, South Vietnam
Southeast Asia, location.location.contains, Empire of Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04ftr19
m.04kb4l7, military.casualties.combatant, North Vietnam
North Vietnam, military.military_combatant.military_conflicts, m.04z0cd1
m.0gm710l, government.national_anthem_of_a_country.country, South Vietnam
South Vietnam, military.military_combatant.military_conflicts, m.05tbj5p
Joint warfare in South Vietnam, 1963–69, time.event.included_in_event, Vietnam War
m.0bd34v7, military.military_combatant_group.combatants, North Vietnam
North Vietnam, common.topic.notable_for, g.12575ynt8
South Vietnam, military.military_combatant.military_conflicts, m.0g5c27c
War in Vietnam, base.culturalevent.event.entity_involved, United States of America
South Vietnam, military.military_combatant.casualties, m.02h77fs
Vietnam, location.location.events, Vietnam War
Indochina Wars, time.event.includes_event, Vietnam War
Quang Binh Province, location.administrative_division.country, Vietnam
North Vietnam, common.topic.image, 北ベトナムの位置
War in Vietnam, base.culturalevent.event.entity_involved, Ho Chi Minh
North Vietnam, location.location.events, Operation Pony Express
Cambodian–Vietnamese War, base.culturalevent.event.entity_involved, China
Vietnam War, common.topic.image, UH-1combatmission1970
North Vietnam, military.military_combatant.military_conflicts, m.07slz04
North Vietnam, military.military_combatant.military_conflicts, m.0gx8n8z
m.0g5dgz6, military.military_combatant_group.combatants, North Vietnam
War in Vietnam (1954-1959), military.military_conflict.combatants, m.09j3ckd
South Vietnam, location.country.capital, Ho Chi Minh City
North Vietnam, military.military_combatant.military_conflicts, m.0b79163

Answer: Cambodia