If the computer looking at the site does not have a Vietnamese font, you are going to get zxnrbl instead. It will try to substitute the closest thing to it, and that could be anything.
Using utf does not guarantee that all of the characters can be displayed on a particular computer. I checked through my fonts, and found only the following languages:
- English
- Western European
- Spanish
- Scandinavian
- Greek
- Russian
- Arabic
- Japanese phonetic
MidiMagic
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