Perhaps you should try some spelling variations:
cong thanh » dong thanh, cong trinh, cong tan
tinh dung » trinh dung, tin dung, tinh huong
hieu soat » hieu suat, hieu hoat, hieu luat
dinh lang » dinh long, dinh rang, dinh quang
lang cong » dang cong, bang cong, hang cong
thanh kim » thanh liem, thanh kinh, khanh kiem
van hieu » cao hieu
kim soat » kiem soat, kim loai, kim hoa

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) OR (tinh quang)) luan van hieu soat ) or ( dinh lang cong thanh kim soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((tinh dung) OR (tinh quang)) luan van hieu soat ) OR ( dinh lang cong thanh kim soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((tinh dung) OR (tinh quang)) luan van hieu soat ) or ( dinh lang cong thanh kim soat ))".
• Adding a wildcard symbol may retrieve word variants: (( ((tinh dung) OR (tinh quang)) luan van hieu soat ) or ( dinh lang cong thanh kim soat ))*.