Perhaps you should try some spelling variations:
huong lquan » luong quan, cuong quan, vuong quan
lquan van » luan van, quan van, luan va
hieu suat » hieu luat, hieu qua
quang cua » quan cua, quang tuan, quang huy
kiem soat » kiem toan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien
cua van » cua ban, cua vat, cua dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( anh huong lquan van hieu suat ) or ( tinh quang cua van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( anh huong lquan van hieu suat ) OR ( tinh quang cua van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( anh huong lquan van hieu suat ) or ( tinh quang cua van kiem soat ))*.