Perhaps you should try some spelling variations:
tinh huong » dinh huong, tinh quang, anh huong
tinh dung » trinh dung, tinh quang, anh dung
hieu soat » hieu suat, hieu hoat, hieu luat
dung quan » dung quang, dung luan, luong quan
tien hoat » trien hoat, thien hoat, tien hoa
van hieu » cao hieu
quan van » quan va, quan luan, quan doan
van tien » toan tien, van tuan

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) or (tinh huong)) luan van hieu soat ) or ( tin dung quan van tien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tinh huong)) luan van hieu soat ) OR ( tin dung quan van tien hoat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) or (tinh huong)) luan van hieu soat ) or ( tin dung quan van tien hoat ))*.