Perhaps you should try some spelling variations:
thuong quang » thong quang, truong quang, phuong quang
huong quang » phuong quang, luong quang, duong quang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
luan » quan, 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 ( tinh ((huong quang) OR (thuong quang)) van kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van hieu soat ) or ( tinh ((huong quang) OR (thuong quang)) van kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh ((huong quang) OR (thuong quang)) van kiem soat ))*.