Perhaps you should try some spelling variations:
tinh huong » dinh huong, tinh quang, anh huong
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
quang van » quang ban, quan van, quang va
quang uan » quang tuan, quang ban, quang tran
kiem soat » kiem toan
van hieu » cao hieu
luan » quan, lan

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tinh huong ((quang van) OR (quang uan)) kiem soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van hieu soat ) or ( tinh huong ((quang van) OR (quang uan)) kiem soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh huong ((quang van) OR (quang uan)) kiem soat ))*.