Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
bien soan » bien so
van hieu » cao hieu
tin nang » tin dung, ki nang, thi nang
nang sua » nang suat, nang dua, nang cua
doi bien » doi dien, voi bien, doi hien
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 soat ) or ( tin nang sua doi bien soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tin nang sua doi bien soan )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tin nang sua doi bien soan ))*.