Perhaps you should try some spelling variations:
luong quang » luong quan, dung quang
cuong quan » luong quan, vuong quan, thong quan
quang quan » quang tuan, quang uan, quan quan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
va hieu » van hieu, va dieu, va hien
quan va » quan vi, quan ha, luan va
va kiem » van kien

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( dinh ((cuong quan) OR (luong quang)) va hieu suat ) or ( tinh quang quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( dinh ((cuong quan) OR (luong quang)) va hieu suat ) OR ( tinh quang quan va kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( dinh ((cuong quan) OR (luong quang)) va hieu suat ) or ( tinh quang quan va kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( dinh ((cuong quan) OR (luong quang)) va hieu suat ) or ( tinh quang quan va kiem soat ))*.