Thank you very much for replying particularly. I think I have to accept this awful truth
Quote:
Some things to check:
* Have you sideloaded a font with all the Vietnamese glyphs you need? Fonts embedded in the book won't be available for use by the rest of the system.
* Have you opened the font menu in the book? That might be necessary to make the other fonts avaiable to the system when reading ePubs, although for KePubs it seems to be enough just to open the book.
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I have done all and nothing seems have changed.
What should I do next?