Non-Latin Vietnamese in Unicode

[tom]

In checking for the locations of classical Vietnamese Chu Han characters in
Unicode, I found some 3300 or so listed in Unihan.txt with TCVN 6056
source.  But looking up several of these characters in the Unihan charts
there appears to be no reference to any Vietnamese source or a Vietnamese
"reading."  Is it just a question of an eventual future updating of the
charts, or are there other reasons for the missing references?  Or am I
looking in the wrong place?

Thanks for the help.  [EMAIL PROTECTED]