Vi·et·nam·ese 
(vē-ĕt′nə-mēz, -mēs, vē′ĭt-, vyĕt′-)
(vē-ĕt′nə-mēz, -mēs, vē′ĭt-, vyĕt′-)adj.
Of or relating to Vietnam or its people, language, or culture.
n. pl. Vietnamese
1.
a. A native or inhabitant of Vietnam.
b. A person of Vietnamese ancestry.
2. The language of the largest ethnic group in Vietnam and the official language of the nation.