Question: Mai Xuân Hợp was a member of Vietnam U23 and played at a football tournament where?

Context paragraphs:
Đoàn Việt Cường: Đoàn Việt Cường (born January 1, 1985 in Đồng Tháp) is a Vietnamese footballer who currently plays for Xuân Thành Sài Gòn in V-League and is,a member of the Vietnam national football team.  His father Đoàn Văn Phát was a player in Dong thap FC just as Viet Cuong was also once before 2009.

International U-21 Thanh Niên Newspaper Cup: The International U-21 Thanh Niên Newspaper Cup is an annual football tournament held in Vietnam.  The tournament was officially launched in 2007 by Thanh Niên News in cooperation with the Vietnam Football Federation, with the aim of improving youth football in Vietnam.  In addition to improving the quality of football in the country, the tournament also serve to help VFF selectors build up the next generation of players who would represent Vietnam at the senior and U23 levels.

VFF Cup: The Vietnam Football Federation Cup or VFF Cup was an annual football tournament organised in Vietnam.  The organisation of the tournament was announced on August 19, 2004, replacing the Independence Cup.  and was played from 2004 to 2011 with the Vietnamese Football Federation announcing in 2012 that the competition would no longer be played.  Every year the tournament is held at the My Dinh National Stadium in Hanoi.  In 2008 the tournament was renamed due to the withdrawal of the Vietnam Bank for Agriculture and Rural Development as the main sponsor.  Participants are either club teams or national teams, but the Vietnam national team is always a participant.

Mai Xuân Hợp: Mai Xuân Hợp (born 14 December 1986 in Thanh Hóa, Vietnam is Vietnamese footballer, who plays for Becamex Bình Dương F.C. as defender.  He was a member of Vietnam U23 played at 2009 Southeast Asian Games.  His favourite positions are centre back and full back.

Football at the 2009 Southeast Asian Games: The football (soccer) tournament at the 2009 Southeast Asian Games in Vientiane of Laos.  The men's tournament is played by U-23 (under 23 years old) national teams, while the women's tournament has no age limit.

1883–84 British Home Championship: The 1883–84 British Home Championship was the inaugural international football tournament, played between the Home Nations of the British Isles which at the time made up the constituent nations of the United Kingdom; England, Scotland, Wales and Ireland.  International football matches had begun with annual games played between England and Scotland in 1872 and they had been joined by Wales in 1876 and Ireland in 1882.  In 1883 the four governing bodies held a conference to standardise the rules of the game and to arrange a tournament to be held yearly in which the four nations would all play each other once in a league format.  This championship would be considered by many to be the world's premier international football tournament for the next 46 years.

Algeria at the Olympic Games Football Tournament: Algeria have appeared in the finals of the Summer Olympics Football Tournament on two occasions in 1980 with the Algeria first team and in 2016 with Algeria U23 after opening olympic football tournament to U23 national teams since 1992.

Football at the 1995 Southeast Asian Games: The football tournament at the 1995 Southeast Asian Games was held from 4 to 16 December in Chiang Mai and Lamphun in Thailand.  All 10 Southeast Asian nations joined the football tournament.

VTV-T&amp;T Cup: The VTV-T&T Cup was an invitational football tournament organised by the Vietnam Football Federation, and sponsored by the T&T Technology and Commerce Ltd. in a US$126,000 deal. .  Apart from host nation Vietnam, under 23 teams from Australia, Iran and Uzbekistan were also invited to compete in the tournament.  The tournament commenced on April 16, 2006 to April 20, 2006.

2008 CONCACAF Women's Pre-Olympic Tournament: The 2008 CONCACAF Women's Olympic Qualifying Tournament was the 2nd edition of the CONCACAF Women's Olympic Qualifying Tournament, the quadrennial international football tournament organised by CONCACAF to determine which two women's national teams from the North, Central American and Caribbean region qualify for the Olympic football tournament.  A total of six teams played in the tournament.

Supporting paragraphs: Mai Xuân Hợp Football at the 2009 Southeast Asian Games
Answer: Vientiane of Laos