Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
minh luong » dinh luong, minh tuong, minh cuong
tinh dung » trinh dung, tin dung, tinh quang
hieu suat » hieu luat, hieu qua
lieu soan » lieu lon, bien soan, lieu quan
quan vat » quan va, quan sat, quan van
lan van » lang van, tan van, san van

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 ((lan van) OR (luan van)) hieu suat ) or ( minh luong quan vat lieu soan ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((lan van) OR (luan van)) hieu suat ) OR ( minh luong quan vat lieu soan )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((lan van) OR (luan van)) hieu suat ) or ( minh luong quan vat lieu soan ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung ((lan van) OR (luan van)) hieu suat ) or ( minh luong quan vat lieu soan ))*.