Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
dung quang » dang quang, dung quan, luong quang
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
kien soat » kiem soat, bien soan, dien hoat
van hieu » cao hieu
kien hoa » dien hoa, tien hoa, kien ha
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 luan van hieu soat ) or ( tinh dung quang thanh ((kien soat) OR (kien hoa)) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung luan van hieu soat ) OR ( tinh dung quang thanh ((kien soat) OR (kien hoa)) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung luan van hieu soat ) or ( tinh dung quang thanh ((kien soat) OR (kien hoa)) ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung luan van hieu soat ) or ( tinh dung quang thanh ((kien soat) OR (kien hoa)) ))*.