Perhaps you should try some spelling variations:
quang tuan » quang thanh, quan luan, quang cua
quan thanh » ban thanh, van thanh
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
dinh hang » dinh hoang, dinh thang, dinh hung
tien soat » trien hoat, thien hoat, kiem soat
van hieu » cao hieu
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 hang ((quang tuan) or (quan thanh)) tien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( dinh hang ((quang tuan) OR (quan thanh)) tien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( dinh hang ((quang tuan) or (quan thanh)) tien soat ))*.