Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
quang uan » quang tuan, quang ban, quang tran
hieu soat » hieu suat, hieu hoat, hieu luat
van kien » van tien, van hien, van chien
kien tra » kiem tra, kien tri, kien truc
van hieu » cao hieu
uan van » quan van, tan van, san van
luan » quan, 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 kien tra ) or ( tinh quang uan van hieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van kien tra ) OR ( tinh quang uan van hieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van kien tra ) or ( tinh quang uan van hieu soat ))*.