Bad news on your "Vietnamese" art purchase. The art
you bought in Vietnam (must have been during the
Pan-Asiatic conference?) looks quite Chinese to me.
It's definitely got literary Chinese grammatical and
basic vocabulary, NOT Vietnamese, and I don't see ANY
No^m words. There is a small handful of words I can't
readily identify, but those might be slight written
variants, which are seen here or there in the Sinitic
world (e.g., Japanese Kanji variants).
If you REALLY want to see No^m writing, go to the
following website which contains files that show the
famous Tale of Kieu in both Quo^'c Ngu+~ and original