Perhaps you should try some spelling variations:
quang quan » quang tuan, quang uan, quan quan
tinh dung » trinh dung, tinh huong, anh dung
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
quan va » quan vi, quan ha, luan va
va hieu » van hieu, va dieu, va hien
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: (( ((tinh dung) OR (tin dung)) quan va hieu suat ) or ( tinh quang quan va kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tin dung)) quan va hieu suat ) OR ( tinh quang quan va kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh dung) OR (tin dung)) quan va hieu suat ) or ( tinh quang quan va kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) OR (tin dung)) quan va hieu suat ) or ( tinh quang quan va kiem soat ))*.