Perhaps you should try some spelling variations:
tinh luong » tinh huong, dinh luong, minh luong
luong quan » thong quan, duong qua
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, dang quang
hieu suat » hieu luat, hieu qua
hieu hoat » hieu hoa, thien hoat, hieu luat
quan van » luan van, quan va, quan luan
van hieu » cao hieu

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 quan van ((hieu suat) or (hieu hoat)) ) or ( tinh luong quan van hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan van ((hieu suat) OR (hieu hoat)) ) OR ( tinh luong quan van hieu suat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan van ((hieu suat) or (hieu hoat)) ) or ( tinh luong quan van hieu suat ))*.