Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
tinh luong » tinh huong, dinh luong, minh luong
tinh dung » trinh dung, tin dung, tinh quang
hieu suat » hieu luat, hieu qua
van hieu » cao hieu
van kien » van tien, van chien
van hien » van tien
luan » lan

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