Perhaps you should try some spelling variations:
hieu nganh » hiem ngan, hieu manh, nghiep nganh
vien nganh » vien thanh
thanh tra » thanh toan, thanh hoa
hang cong » dang cong, hang nong, bang cong
van hang » van khang, van hoang, van thang
cong san » cong tac
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac
tra van » tran van, ta van, trang van

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu nganh) OR (vien nganh)) - thanh tra van hang cong san ((than cao) OR (than cap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu nganh) OR (vien nganh)) - thanh tra van hang cong san ((than cao) or (than cap))~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu nganh) OR (vien nganh)) - thanh tra van hang cong san ((than cao) or (than cap))*.