Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
hieu luat » hieu qua
tinh dung » trinh dung, tin dung, tinh huong
tran van » luan van
van hieu » cao hieu
dung lam » dung luan, dung tai, dung dat
van bien » van tien, van hien, vat bien
lam van » lam san, nam van, dam van
bien so » bien doi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh quang tran van hieu luat ) or ( tinh dung lam van bien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tran van hieu luat ) OR ( tinh dung lam van bien so ))*.