Vietnamese subtitles were added relatively recently, so older versions of Despecialized don’t have them (such as Empire). You can download the current version of Project Threepio (also on TehParadox, see first post) and add them yourself.
I definitely would want some checking done with the Vietnamese subs. These are random SE fansubs I found on the Internet, that I modified to match Harmy’s versions. They could have major problems (from the original or my conversion), for which I apologize. If you have corrected text or even complete corrected SRT files, you can PM me.