Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh quang
dung quan » dung quang, dung luan, luong quan
hieu soat » hieu suat, hieu luat, hieu so
hieu hoat » hieu hoa, thien hoat, hieu luat
tinh quan » tinh quang, trinh quan, tin quan
quan quan » quan quang, qua quan, quan luan
kiem soat » kiem toan
quan han » quan hanh, quanh han, quan hai
han kiem » phan kiem, hoan kiem, van kiem
quan ha » quan he

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 ha ((hieu soat) or (hieu hoat)) ) or ( tinh quan quan han kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung quan ha ((hieu soat) OR (hieu hoat)) ) OR ( tinh quan quan han kiem soat )).
• Adding a wildcard symbol may retrieve word variants: (( tinh dung quan ha ((hieu soat) or (hieu hoat)) ) or ( tinh quan quan han kiem soat ))*.