Jean Christophe André added the comment:

I failed to find anything about TCVN 5712:1999 except the official announcement 
of it superseding TCVN 5712:1993 on TCVN's website. I also was not able to find 
any material using TCVN 5712:1999. My guess is that TCVN 6909:2001 having been 
released only 2 years after, TCVN 5712:1999 probably had no time to get in real 
use.

Anyway, TCVN 5712:1993 is the real one, the one having been in used for almost 
2 decades. So this is why I provided codec tables for this one.

There is 3 flavors of it. The most used one for documents is the third one 
(TCVN 5712:1993 VN3). It is used with the so called “ABC fonts” which are of 
common knowledge in Vietnam. But the first one may be of use in databases. I 
never got access to real (large) Vietnamese databases so I can't confirm it for 
sure. I still provided the 3 flavors, just in case.

Still, since VN3 is a subset of VN2, which itself is a subset of VN1, you may 
choose to only include the first one, TCVN 5712:1993 VN1, I leave this up to 
you. FYI, GNU Recode and Glibc Iconv currently implement "tcvn" as VN1. (but 
the Epson printer company implement VN3…)

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