Perhaps you should try some spelling variations:
tinh huong » dinh huong, tinh quang, anh huong
dung toan » dung doanh, dung thang, dung thanh
hieu soat » hieu suat, hieu hoat, hieu luat
tinh dung » tin dung, tinh quang, anh dung
hien soat » thien hoat, kiem soat, bien soan
toan tap » toan ban
tap hieu » tap sieu, thap chieu, phap hieu
van hien » van hieu, van tien

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh dung toan tap hieu soat ) OR ( ((tinh dung) OR (tinh huong)) luan van hien soat ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( trinh dung toan tap hieu soat ) or ( ((tinh dung) OR (tinh huong)) luan van hien soat ))~".
• Adding a wildcard symbol may retrieve word variants: (( trinh dung toan tap hieu soat ) or ( ((tinh dung) OR (tinh huong)) luan van hien soat ))*.