Perhaps you should try some spelling variations:
quang luan » quan luan, quang tuan, quang uan
tinh dung » trinh dung, tin dung, tinh huong
dung quan » dung quang, dung luan, luong quan
quan doan » quan hoang, chuan doan, chan doan
doan hieu » doanh hieu, doan dieu, doan thien
hieu suat » hieu luat, hieu qua
kien soat » kiem soat, bien soan, kien hoa
van kien » van tien, van hien, van chien

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