Perhaps you should try some spelling variations:
quan quang » qua quang, quan quan, quat quang
quang van » quan van, quang uan, quang vinh
quang ban » quang binh, quang tuan, quang tran
hieu suat » hieu luat, hieu qua
minh quan » minh quang, minh tuan, manh quan
kiem soat » kiem toan
quang va » quan va, quang ma, quang nam
va kiem » van kien
tin » tinh

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

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