Perhaps you should try some spelling variations:
hieu nganh » vien nganh, hiem ngan, hieu manh
nhung cong » dung cong, hang cong, nhung don
thong cong » trong cong, tong cong, thong thong
hieu xanh » chieu xanh, hieu manh, dieu hanh
tranh van » tran van, trinh van, thanh van
van thong » van thuong, van phong, va thong
thong tu » phong tuc, thong tin, thong ke

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu xanh) OR (hieu nganh)) - canh tranh van ((nhung cong) or (thong cong)) van thong tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu xanh) OR (hieu nganh)) - canh tranh van ((nhung cong) OR (thong cong)) van thong tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu xanh) OR (hieu nganh)) - canh tranh van ((nhung cong) or (thong cong)) van thong tu".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu xanh) OR (hieu nganh)) - canh tranh van ((nhung cong) or (thong cong)) van thong tu*.