Perhaps you should try some spelling variations:
luong quang » dung quang
luong quan » thong quan, duong qua
tinh dung » trinh dung, tin dung, tinh quang
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
luan » lan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh dung luan van hieu suat ) or ( tinh ((luong quan) or (luong quang)) van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu suat ) OR ( tinh ((luong quan) OR (luong quang)) van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu suat ) or ( tinh ((luong quan) or (luong quang)) van kiem soat ))*.