Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
chuan doan » chan doan
tinh dung » trinh dung, tin dung, tinh quang
dung nang » dun nang, dung dang, dung quang
hieu luat » hieu qua
kien soat » bien soan, kien hoa, dien hoat
kiem soat » kiem toan
nang van » dang van, tang van, lang van
van hieu » cao hieu
doan van » doan va, hoang van, luan van

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 nang van hieu luat ) OR ( trinh chuan doan van ((kien soat) OR (kiem soat)) ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh dung nang van hieu luat ) or ( trinh chuan doan van ((kien soat) or (kiem soat)) ))*.