Perhaps you should try some spelling variations:
tung dand » dung dan, dung danh, tang dan
hieu suat » hieu luat, hieu qua
dung quan » dung quang, dung luan, luong quan
tien soat » trien hoat, thien hoat, kiem soat
tung dan » dung dan, huong dan, trung dai
quan van » luan van, quan va, quan luan
van tien » toan tien, van hieu, van tuan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( trinh ((tung dan) or (tung dand)) cao hieu suat ) or ( trinh dung quan van tien soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( trinh ((tung dan) OR (tung dand)) cao hieu suat ) OR ( trinh dung quan van tien soat )).
• Adding a wildcard symbol may retrieve word variants: (( trinh ((tung dan) or (tung dand)) cao hieu suat ) or ( trinh dung quan van tien soat ))*.