Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tinh quang, tinh huong
quang van » quang ban, quan van, quang uan
hieu soat » hieu suat, hieu hoat, kiem soat
hieu luat » hieu qua
van kiem » va kiem, van kien, van hieu
luan » quan, lan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tin dung luan van kiem tra ) or ( tinh dung quang van ((hieu soat) or (hieu luat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tin dung luan van kiem tra ) OR ( tinh dung quang van ((hieu soat) OR (hieu luat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan van kiem tra ) or ( tinh dung quang van ((hieu soat) or (hieu luat)) ))*.