Unicode Subtitle does not show correctly

I have a film with vietnamese unicode subtitle, (.srt file). Subtitle does not correctly show on the WD Stream HD but it shows perfectly with  the PC. I do not know if  it the known issue or not.  Thanks for any hints.

You will have to try something like this: http://community.wdc.com/t5/WD-TV-Live-General-Discussions/Unicode-support/m-p/8050#M3139

WD definitively said it does not support  Vietnamese Unicode subtitle. I have to change to other brand name.