Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
kiem toan » ke toan, kiem tra
van hieu » cao hieu
quan han » quan hanh, quanh han, quan hai
van kiem » va kiem, van kien, van hien
quan ha » quan he
luan » lan

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 luan van hieu soat ) OR ( trinh ((quan han) OR (quan ha)) van kiem toan ))~.
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( trinh ((quan han) or (quan ha)) van kiem toan ))*.