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

CJKV

    CJK plus Vietnamese.  Vietnamese, like the
   other three CJK languages, requires 16-bit character
   encodings but it does not use Han characters.

   ["CJKV Information Processing: Chinese, Japanese, Korean &
   Vietnamese Computing", Ken Lunde, pub. O'Reilly 1998,
   (http://oreilly.com/catalog/cjkvinfo/)].

   (2001-03-18)