Perhaps you should try some spelling variations:
vuong quan » luong quan, cuong quan, luong quang
dinh vuong » dinh duong, dinh huong, dinh cuong
hieu suat » hieu luat, hieu qua
quan dong » quang dong, quan long, quan hoang
dung tan » dung toan, duong tan, dung tai
van hieu » cao hieu
tan van » tran van, tang van, luan van
dong ke » dong kem, dong ket, dong ky
toan » tran

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 tan van hieu suat ) or ( dinh vuong quan dong ke toan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung tan van hieu suat ) OR ( dinh vuong quan dong ke toan )).
• Adding a wildcard symbol may retrieve word variants: (( trinh dung tan van hieu suat ) or ( dinh vuong quan dong ke toan ))*.