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As far as I know, there is no way to embed a font inside a Kobo dictionary, for the reader/app to use it when displaying the dictionary definition.
Hence, all you have is the default "Kobo" font: if it does not have glyphs for certain (or even all) Vietnamese characters, you are out of luck.
(Maybe custom firmwares do have the possibility of changing the dictionary font --- I do not know for sure, try searching the Kobo Developer part of this forum.)
I have tried reaching the Kobo devs several times, asking them for the dictionary format documentation and official support for custom dictionaries, but with zero results.
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Is the dictionary linked above still usable? Would you like me to list it in the index in the first post?
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