WordNet (r) 3.0 (2006):

Vietnamese
    adj 1: of or relating to or characteristic of Vietnam or its
           people or its language ; "the Vietnamese countryside";
           the Vietnamese tones"; "Vietnamese boat people"
    n 1: a native or inhabitant of Vietnam [syn: Vietnamese,
         Annamese]
    2: the Mon-Khmer language spoken in Vietnam [syn: Vietnamese,
       Annamese, Annamite]

The Free On-line Dictionary of Computing (30 December 2018):

Vietnamese

    An Asian language that, like other CJKV
   languages, requires 16-bit character encodings but, unlike
   them, does not use Han characters.

   While normal Vietnamese has not used Han characters since the
   18th century, the standards TCVN 5773 and TCVN 6056
   contain Han characters and may be used by computers and
   academics.

   (2001-01-01)