Perhaps you should try some spelling variations:
tinh huong » dinh huong, tinh quang, anh huong
dung quang » dang quang, dung quan, luong quang
tinh dung » tin dung, tinh quang, anh dung
hieu soat » hieu suat, hieu hoat, hieu luat
mien soat » kiem soat, bien soan, dien hoat
van hieu » cao hieu
quang vi » quan vi, quang si, quang va

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