Perhaps you should try some spelling variations:
tinh dung » trinh dung, tin dung, tinh huong
hieu suat » hieu luat, hieu qua
quang ban » quang binh, quang tuan, quang tran
kiem soat » kiem toan
quan van » luan van, quan va, quan doan
van kiem » va kiem, van kien, van hieu
ban van » ban dan, ban va, tan van

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 van) OR (quan luan)) hieu suat ) or ( tinh quang ban van kiem soat ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tinh dung ((quan van) OR (quan luan)) hieu suat ) OR ( tinh quang ban van kiem soat )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( tinh dung ((quan van) OR (quan luan)) hieu suat ) or ( tinh quang ban van kiem soat ))".
• Adding a wildcard symbol may retrieve word variants: (( tinh dung ((quan van) OR (quan luan)) hieu suat ) or ( tinh quang ban van kiem soat ))*.