Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
hieu soat » hieu suat, hieu hoat, hieu luat
tin quang » tinh quang, trien quang, tran quang
dung tan » dung toan, duong tan, dung tai
tin quan » tinh quang, trinh quan, lien quan
van lien » van tien, van hien, va lien
tan cao » toan cao, tao cao, tay cao
lien so » lien son, bien so, lieu so

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 tan cao hieu soat ) or ( ((tin quan) or (tin quang)) luan van lien so ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung tan cao hieu soat ) OR ( ((tin quan) OR (tin quang)) luan van lien so )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung tan cao hieu soat ) or ( ((tin quan) or (tin quang)) luan van lien so ))*.