Perhaps you should try some spelling variations:
nang quan » ban quan, nang suat
hieu luat » hieu qua
kien soat » kiem soat, bien soan, kien hoa
tin nang » tin dung, ki nang, thi nang
quan vi » quan li, quan tri, quan doi
vi hieu » vi dieu, va hieu, vo hieu
tan van » tran van, tang van, dang van
luan » lan

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: (( tin nang quan vi hieu luat ) OR ( tinh quang ((tan van) OR (luan van)) kien soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tin nang quan vi hieu luat ) or ( tinh quang ((tan van) or (luan van)) kien soat ))*.