Perhaps you should try some spelling variations:
tinh huong » dinh huong, anh huong
quang quan » quang tuan, quang uan, quan quan
hieu soat » hieu suat, hieu hoat, hieu luat
kiem soat » kiem toan
quan van » luan van, quan luan, quan doan
van kiem » va kiem, van kien, van hieu
quan va » quan vi, quan ha, luan va
va hieu » van hieu, va dieu, va hien

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

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