Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
nhung cong » dung cong, hang cong, nhung don
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh van » tran van, trinh van, thanh van
van thong » van thuong, van phong, va thong
doc hieu » toc thieu, hoc thieu, hoc hien
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 - 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 - canh tranh van ((nhung cong) OR (thong cong)) van thong tu".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh van ((nhung cong) OR (thong cong)) van thong tu*.