Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
cong quan » cuong quan, cong quang, tong quan
van hieu » cao hieu
thi cong » tai cong, thien cong
quan hoi » quang hoi, quan doi, quan hai
hoi vien » hoc vien, hoi viet, thoi hien
vien so » bien so, viec so, vien co
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 ( thi cong quan hoi vien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( thi cong quan hoi vien so )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( thi cong quan hoi vien so ))*.