Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu xanh » hieu manh, hieu nganh, dieu hanh
hanh doan » hanh doanh, thanh toan, thinh doan
hang cong » dang cong, hang nong, bang cong
tang van » dang van, hoang van, trong 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 xanh) OR (chieu xanh)) - hanh doan va ((thong cong) OR (hang cong)) tang van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (chieu xanh)) - hanh doan va ((thong cong) or (hang cong)) tang van ban~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (chieu xanh)) - hanh doan va ((thong cong) or (hang cong)) tang van ban*.