Perhaps you should try some spelling variations:
quan duong » tuan duong, quan dong, qua duong
duong quan » duong quang, duong qua, luong quan
duong kieu » duong dieu, duong tieu, duong vien
tinh dung » trinh dung, tinh quang, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
kieu soat » kiem soat, hieu suat, hieu hoat
van hieu » cao hieu
luan » 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 soat ) or ( dinh duong quan duong kieu soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tin dung)) luan van hieu soat ) OR ( dinh duong quan duong kieu soat )).
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) or (tin dung)) luan van hieu soat ) or ( dinh duong quan duong kieu soat ))*.