Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
dung quan » dung quang, dung luan, luong quan
hieu suat » hieu luat, hieu qua
quang uan » quang tuan, quang ban, quang tran
kiem soat » kiem toan
quan va » quan vi, quan ha, luan va
va hieu » van hieu, va dieu, va hien
va kiem » van kien
uan va » luan va, ban va, dan va

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