Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu nganh, dieu hanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh van » tran van, trinh van, thanh van
cong vang » cong lang, cong quang, cong ngang
van hang » van khang, van hoang, van thang
cong van » cong san, song van, cong tan
phong tu » phong tuc, thong tu, phong thuy

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