That was not my point. I mentioned Vietnamese because the spacing it uses is interesting.

Also like dfcowell said, Vietnamese used to be written with han & chu nôm characters (respectively Chinese characters and Chinese-like characters created by Vietnamese), a lot of which are encoded in Unicode. Hence the existence of the CJKV acronym.

It is actually CJKV to deal with historical Vietnamese.

From Unicode spec:

> Although the term “CJK”—Chinese, Japanese, and Korean is used throughout this text to describe the languages that currently use Han ideographic characters, it should be noted that earlier Vietnamese writing systems were based on Han ideographs. Consequently, the term “CJKV” would be more accurate in a historical sense. Han ideographs are still used for historical, religious, and pedagogical purposes in Vietnam.

Traditional Vietnamese (before French colonialism) used Chinese characters.