Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu toan » bieu toan, thien toan, kiem toan
quang tan » quang tuan, quang tran, quang toan
hieu soat » hieu suat, hieu luat, kiem soat
hieu hoat » hieu hoa, thien hoat, hieu luat
van hieu » cao hieu
tan van » tran van, tang van, dang 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 hieu toan ) or ( tinh quang tan van ((hieu soat) or (hieu hoat)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu toan ) OR ( tinh quang tan van ((hieu soat) OR (hieu hoat)) )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu toan ) or ( tinh quang tan van ((hieu soat) or (hieu hoat)) ))*.