Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
thanh tra » thanh toan, thanh hoa
hang cong » dang cong, bang cong, thanh cong
hang nong » thang long, han tong
doc hieu » toc thieu, hoc thieu, hoc hien
tra tuan » tran tuan, tra quan, tri tuan
van than » van thanh, van thang, van tuan

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 xanh - thanh tra tuan ((hang cong) OR (hang nong)) ((van than) OR (dan ca)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - thanh tra tuan ((hang cong) OR (hang nong)) ((van than) or (dan ca)) cau~".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - thanh tra tuan ((hang cong) OR (hang nong)) ((van than) or (dan ca)) cau*.