Perhaps you should try some spelling variations:
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tinh quang, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
quang doi » quan doi, quang hoi, quang dai
bien soan » bien so
van hieu » cao hieu
doi bien » doi dien, voi bien, doi hien
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: (( tinh dung luan van hieu soat ) or ( tin dung quang doi bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tin dung quang doi bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tin dung quang doi bien soan ))*.