Perhaps you should try some spelling variations:
quang phan » quang chan, quang phat, quang thanh
minh cong » minh cuong, sinh cong, minh hoang
qua quang » quan quang, quat quang, qua quan
phan hieu » van hieu, phan kien, gian hieu
hieu suat » hieu luat, hieu qua
cong tac » cong ty
dinh qua » dinh cua, dinh quy, danh qua
va bien » vat bien, va lien, va dien
bien so » bien doi
tac va » tac da, tac xa, tuc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( minh cong tac va bien so ) or ( dinh qua quang phan hieu suat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( minh cong tac va bien so ) OR ( dinh qua quang phan hieu suat ))*.