Perhaps you should try some spelling variations:
chuan luan » chuyen luan, chuan doan, chuan san
dung dang » dung dan, dung dong, dung danh
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
dang van » hoang van, hang va
van hieu » cao hieu
van kiem » va kiem, van kien, van hien

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