Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
dung quang » dang quang, luong quang, dung luan
dung quan » dung luan, luong quan, dang quang
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
van hieu » cao hieu
tran dan » tran dang, tran danh, tran doan
dan kiem » van kiem, toan kiem, phan kiem

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 quan) or (dung quang)) van hieu suat ) or ( tinh quang tran dan kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh ((dung quan) OR (dung quang)) van hieu suat ) OR ( tinh quang tran dan kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh ((dung quan) or (dung quang)) van hieu suat ) or ( tinh quang tran dan kiem soat ))*.