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