Perhaps you should try some spelling variations:
luong quan » thong quan, duong qua
tinh dung » tin dung, tinh quang, tinh huong
hieu suat » hieu luat, hieu qua
tin luong » tien luong, tin huong, tin tuong
luan cao » juan cao, luan bao, quang cao
quan doi » quan tri, quan li
doi bien » doi dien, voi bien, doi hien
bien so » bien doi

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