Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu luat » hieu qua
binh dang » binh dan, binh duong, binh giang
dang quan » dang quang, nang quan, dung quan
kiem soat » kiem toan
quan cau » quang cao, toan cau, quan cua
quan ha » quan he
quan va » quan vi, luan va, quan ve
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: (( tinh dung ((quan cau) OR (quan ha)) hieu luat ) OR ( binh dang quan va kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((quan cau) OR (quan ha)) hieu luat ) or ( binh dang quan va kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung ((quan cau) OR (quan ha)) hieu luat ) or ( binh dang quan va kiem soat ))*.