vietnamese language PDF issue

Hi All,

I have developed a script for Vietnam in Vietnamese language.In print preview its displaying properly but if i download it as PDF that script displaying some strange text.

I translated the text in SE76 but that was not useful

Do we need to install respective adobe readers to see vietnamese language?

In the server VI language fonts are uploaded that i could see in the tcode I18N.

Prin preview

PDF View:

Please let me know if any one faced the same issue before

Thanks

Naresh Bammidi