Perhaps you should try some spelling variations:
quang tan » quang tuan, quang tran, quang toan
hieu soat » hieu hoat, hieu luat, kiem soat
danh nhan » doanh nhan, thanh nhan, benh nhan
luan hieu » luan tieu, luan dieu, luan thiet
hieu suat » hieu luat, hieu qua
van hieu » cao hieu
tan van » tran van, tang van, luan van
nhan ly » nhan y, nha ly, nhan ky
tinh » trinh, dinh, minh

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 tan van hieu soat ) or ( danh nhan ly luan hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh quang tan van hieu soat ) OR ( danh nhan ly luan hieu suat ))*.