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