Perhaps you should try some spelling variations:
dinh luong » dinh duong, dinh huong, dinh cuong
tinh huong » dinh huong, anh huong
hieu luat » hieu qua
quang tan » quang tuan, quang tran, quang toan
kiem soat » kiem toan
quan va » quan vi, quan ha, luan va
va hieu » van hieu, va dieu, va hien
va kiem » van kien
tan va » tan van, toan va, than va

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: (( ((dinh luong) OR (tinh huong)) quan va hieu luat ) OR ( tinh quang tan va kiem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( ((dinh luong) or (tinh huong)) quan va hieu luat ) or ( tinh quang tan va kiem soat ))*.