Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, nhung don
hanh doanh » hang doanh, chinh doanh, doanh doanh
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang cong » dang cong, hang nong, bang cong
doanh va » doan va, doanh tai, doanh cua
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 (hieu manh)) - hanh doanh va ((nhung cong) OR (hang cong)) tang van ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu manh)) - hanh doanh va ((nhung cong) or (hang cong)) tang van ban~".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu manh)) - hanh doanh va ((nhung cong) or (hang cong)) tang van ban*.