Perhaps you should try some spelling variations:
quang tran » quang tuan, quang trung, quang thanh
thien hoat » trien hoat, thien thuat, tien hoa
tinh dung » trinh dung, tinh huong, anh dung
hieu suat » hieu luat, hieu qua
van thien » van tien, van hien, van chien
van hieu » cao hieu
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) or (tin dung)) luan van hieu suat ) or ( tinh quang tran van thien hoat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tin dung)) luan van hieu suat ) OR ( tinh quang tran van thien hoat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) or (tin dung)) luan van hieu suat ) or ( tinh quang tran van thien hoat ))*.