Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
dinh dang » dinh dung, binh dang, dinh lang
quang van » quang ban, quang uan, quang va
tien soat » trien hoat, thien hoat, kiem soat
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
luan » lan

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