Question: Phi Fa is a ghost in the folklore of the country that is bordered by what country on its southwest?

Context paragraphs:
Laos: Laos ( , , , or ; Lao: ລາວ , ] , "Lāo"), officially the Lao People's Democratic Republic (Lao: ສາທາລະນະລັດ ປະຊາທິປະໄຕ ປະຊາຊົນລາວ, "Sathalanalat Paxathipatai Paxaxon Lao") or commonly referred to its colloquial name of Muang Lao (Lao: ເມືອງລາວ, "Muang Lao"), is a landlocked country in the heart of the Indochinese peninsula of Mainland Southeast Asia, bordered by Myanmar (Burma) and China to the northwest, Vietnam to the east, Cambodia to the southwest, and Thailand to the west and southwest.

Pob Pee Fa (2009 TV series): Pob Pee Fa (Thai: ปอบผีฟ้า ; rtgs: "Pop Phi Fa" ) is a Thai period horror "lakorn", a remake of the 1997 lakorn "Pob Pee Fa" with the role of Pee Fah or Jao Nang Luang on Torn played by the awarding winning actress, Chiranan Manochaem (จีระนันท์ มะโนแจ่ม).  Other scheduled cast members include Thana Suttikamul (ธนา สุทธิกมล) and the Thai-British model and actress, Buntitha Puwijarn Cowell (บัณฑิตา ภูวิจารณ์ เคาวเวลล์).

Delta Theta Phi: Delta Theta Phi (ΔΘΦ) is a professional law fraternity and a member of the Professional Fraternity Association.  Delta Theta Phi is the only one of the two major law fraternities to charter chapters (senates) in the United States at non-American Bar Association-approved law schools.  Delta Theta Phi can trace its roots to 1900 at the then-named Cleveland Law School.  Delta Theta Phi has initiated more than 136,000 members across the country and in several other nations.

Pop (ghost): Pop (Thai: ปอบ ) is a cannibalistic female spirit of Thai folklore.  It manifests itself as a woman that likes to devour human viscera.  Pop is related to the Phi Fa spirit.

Levette J. Davidson: Levette J. Davidson was a nationally acclaimed expert in folklore, especially that of Colorado and the West.  He was born in Eureka, Illinois May 16, 1894, one of four children.  Because his grand uncle was past-President of Eureka College, a Christian seminary, Davidson was "reared in the school's shadow" with the option of becoming "either a teacher or a preacher."  He chose teaching and was awarded his B.A. from Eureka in 1915.  A year later he received his A.M. degree from the University of Illinois where he received Phi Beta Kappa honors.  In 1917 he earned his M.A. in social science and history at Harvard University.  __During World War I, he served with the Tenth Infantry of the Forty-Sixth Division and also served as an army sergeant in Intelligence.  Davidson and his wife Mary, also a graduate of Eureka, were married in 1918.  At the end of the war, Davidson simultaneously taught and studied at the University of Michigan where he earned a Ph.D. in languages and literatures in 1922.  He arrived in Denver later that year and began teaching at the University of Denver.  Before arriving in Colorado, his academic specialty was eighteenth century England.  Once in Denver, he realized that Western literature and folklore would be his life work.  Davidson taught at the University of Denver until his death in 1957.  His course topics ranged from studies of Shakespeare and other English literature, to folklore in the West.  He began teaching news writing and eventually founded the journalism department at the University as well as the board of publications and the press club.  He was the first faculty member elected to serve as president of the University Senate.  In 1940 he became head of the English Department and from March to August 1953 he served as interim Chancellor.  At the time of assuming his post, he remarked: "There is hardly an organization on campus that I have not been connected with at one time or another."  Davidson was named University Lecturer for 1956.  Davidson was a director of the Colorado State Historical Society, the Modern Languages Association, the American Folklore Society, and the American Dialect Society.  He was a charter member of the Denver Posse of the Westerners, an organization devoted to western folklore.  In spare moments, Davidson conducted research, wrote outlines for plays, and authored a large number of articles.  He contributed to a wide range of magazines from "Western American" to "Shakespeare Quarterly".  Additionally, Davidson authored several books on folklore.  The most widely recognized is "Rocky Mountain Tales", which presents regional folklore as well as true accounts of early events in the area.  Levette Davidson died May 14, 1957.

Phi Fa: Phi Fa (Thai: ผีฟ้า , Lao: ຜີຟ້າ ) is a ghost or spirit in the local folklore of northeast Thailand and Laos.  It is also known as "Nang Fa" (นางฟ้า) or "Phi Thaen" (ผีแถน) and is often represented as a malevolent woman related to the cannibalistic pop "phi".  Phi Fa is believed to bring about disease and natural disasters.

Phi phong: Phi Phong or Phi Pong (Thai: ผีโพง , ผีโป่ง) is a Thai ghost of Northern folk beliefs.  It has another name in the Isan language (Northeast dialect) as Phi Phao (ผีเป้า).

Latino Greek Movement: The Latino Greek Movement seen on college campuses in the United States (excluding Puerto Rico) was founded in New Jersey on December 1, 1975.  The first organization established to lead this movement is Lambda Theta Phi Latin Fraternity, Inc. at Kean University in Union New Jersey.  With its birth, Lambda Theta Phi became the first organization to serve the Latino community in the United States.  With the organizations second chapter at Rutgers University-New Brunswick in the fall of 1978, Lambda Theta Phi was well on its way to growing the Latino Greek movement.  A Latina sorority was established soon after Lambda Theta Phi at Kean University as well.  Lambda Theta Alpha Latin Sorority, Inc. became the first Latina Greek-lettered organization in the country.  Both of these Greek-lettered organizations saw the Latino Greek Movement's infancy days.  The movement was created in the state of New Jersey with the establishment of other organizations.

Phi Kappa Psi: Phi Kappa Psi (ΦΚΨ, Phi Psi) is an American collegiate social fraternity that was founded in the southwest corner of the second floor of Widow Letterman's home on the campus of Jefferson College in Canonsburg, Pennsylvania on February 19, 1852.  There are over 100 chapters and colonies at accredited four year colleges and universities throughout the United States.  More than 119,000 men have been initiated into Phi Kappa Psi since its founding.  Phi Kappa Psi and Phi Gamma Delta, both founded at the same college, form the Jefferson Duo.

Pob Pee Fah: Pob Pee Fah (Thai: ปอบผีฟ้า ; rtgs: "Pop Phi Fa" ) is a Thai ghost story, made as a TV series (known as a "lakorn", the Thai equivalent of a soap opera).  Set partly in the 19th century, it shares some plot details with an earlier series, "Jao Nang", which aired in 1990, and on which some observers believe it was based.

Supporting paragraphs: Phi Fa Laos
Answer: Cambodia