Perhaps you should try some spelling variations:
huong quan » luong quan, cuong quan, vuong quan
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 khu » quan he, quan ha, quan su
khu kiem » thu kiem, khuan kiem, phtu 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 ( anh huong quan khu kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tich nang suat van hieu suat ) OR ( anh huong quan khu kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tich nang suat van hieu suat ) or ( anh huong quan khu kiem soat ))*.