Hi Fabrice,
Thank you for your response. I followed your instruction. I set both font setting and text encoding to Vietnamese but when I save it, it still shows question mark. Is there anything else that I can try? By the way, is there anyway that you can test on your computer to see the result? If you succeed, can you show me how? Try this text “Bây giờ”. On my computer, after saving, it shows “Bây gi?”
Thank you
-Khanh