Perhaps you should try some spelling variations:
tinh huong » dinh huong, anh huong
huong luan » huong lan, cuong luan, huong loan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
van hieu » cao hieu
tuan van » tran van, quan van, toan van
tan van » tran van, tang van, dang van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( tinh huong luan van hieu suat ) or ( tinh quang ((tuan van) OR (tan van)) kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh huong luan van hieu suat ) OR ( tinh quang ((tuan van) OR (tan van)) kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh huong luan van hieu suat ) or ( tinh quang ((tuan van) OR (tan van)) kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh huong luan van hieu suat ) or ( tinh quang ((tuan van) OR (tan van)) kiem soat ))*.