Perhaps you should try some spelling variations:
dung quang » dang quang, luong quang, dung ung
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
dung quan » luong quan, dang quang, dung cua
hien soat » thien hoat, kiem soat, bien soan
van hieu » cao hieu
van hien » van tien
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 luan van hieu soat ) or ( tinh ((dung quan) or (dung quang)) van hien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tinh ((dung quan) OR (dung quang)) van hien soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh ((dung quan) or (dung quang)) van hien soat ))*.