Perhaps you should try some spelling variations:
tinh luong » tinh huong, minh luong, tinh cuong
dinh luong » dinh duong, dinh huong, dinh cuong
hieu suat » hieu luat, hieu qua
quang tan » quang tuan, quang tran, quang toan
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu
tan van » tran van, tang van, luan van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh luong) OR (dinh luong)) quan vi hieu suat ) OR ( tinh quang tan van kien soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh luong) OR (dinh luong)) quan vi hieu suat ) or ( tinh quang tan van kien soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( ((tinh luong) OR (dinh luong)) quan vi hieu suat ) or ( tinh quang tan van kien soat ))*.