Perhaps you should try some spelling variations:
huong quan » luong quan, cuong quan, vuong quan
dinh huong » dinh duong, anh huong
tich nang » tich van, tin nang
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
suat van » suat va, sat van, suat nang
van hieu » cao hieu
quan ha » quan he
ha kiem » hoa kiem, va kiem, phan kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tich nang suat van hieu suat ) or ( dinh huong quan ha kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tich nang suat van hieu suat ) OR ( dinh huong quan ha kiem soat ))*.