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