Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
huong quan » luong quan, cuong quan, vuong quan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
thanh va » thanh van, hanh va, thanh ha
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu
va kiem » van kien

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: (( anh huong quan vi hieu suat ) OR ( tinh quang thanh va kiem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( anh huong quan vi hieu suat ) or ( tinh quang thanh va kiem soat ))*.