Perhaps you should try some spelling variations:
dung dang » dung dan, dung dong, dung danh
kiem soat » kiem toan
giao hieu » gian hieu, gia hieu, gio hieu
hieu quan » hieu qua, lieu quan, thien quan
dang van » hoang van, hang va
van kiem » va kiem, van kien, van hieu
dung lam » dung luan, dung tai, dung ha
dung dat » dung va, dung tai

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: (( trinh dung dang van kiem soat ) OR ( tinh ((dung lam) OR (dung dat)) giao hieu quan ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung dang van kiem soat ) or ( tinh ((dung lam) OR (dung dat)) giao hieu quan ))~".
• Adding a wildcard symbol may retrieve word variants: (( trinh dung dang van kiem soat ) or ( tinh ((dung lam) OR (dung dat)) giao hieu quan ))*.