Perhaps you should try some spelling variations:
hien manh » hien hanh, tien manh, hieu manh
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
cong vang » cong quang, cong ngang, cong san
cong lang » cong luong, cong quang, cong ngang
cong van » cong san, song van, cong tan
chat cam » chat cao, thuat cam, chat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien manh - canh tranh van nhung ((cong van) or (((cong vang) or (cong lang)))) chat cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien manh - canh tranh van nhung ((cong van) OR (((cong vang) OR (cong lang)))) chat cam.
• Adding a wildcard symbol may retrieve word variants: hoc hien manh - canh tranh van nhung ((cong van) or (((cong vang) or (cong lang)))) chat cam*.