Perhaps you should try some spelling variations:
quang dinh » quang ninh, quang binh, quang minh
huong quan » luong quan, cuong quan, vuong quan
hieu suat » hieu luat, hieu qua
kiem soat » kiem toan
quan van » luan van, quan va, quan luan
van hieu » cao hieu
van kiem » va kiem, van kien, van hien

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 quan van hieu suat ) or ( tinh quang dinh van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( anh huong quan van hieu suat ) OR ( tinh quang dinh van kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( anh huong quan van hieu suat ) or ( tinh quang dinh van kiem soat ))*.