Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
luong luan » luong quan, luong xuan, cuong luan
dung lang » dung dang, dung nang, dung land
hieu suat » hieu luat, hieu qua
bien soan » bien so
lang van » dang van, tang van, hoang van
van hieu » cao hieu
van bien » van tien, van hien, vat bien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh dung lang van hieu suat ) or ( tinh luong luan van bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung lang van hieu suat ) OR ( tinh luong luan van bien soan ))*.