Perhaps you should try some spelling variations:
hieu suat » hieu luat, hieu qua
quang uan » quang tuan, quang ban, quang tran
kiem soat » kiem toan
luan can » luan van, luan san, luan han
can hieu » can nhieu, cao hieu, van hieu
va kiem » van kien
uan va » luan va, quan va, ban va

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 dung luan can hieu suat ) OR ( tinh quang uan va kiem soat ))~.
• Adding a wildcard symbol may retrieve word variants: (( tin dung luan can hieu suat ) or ( tinh quang uan va kiem soat ))*.