Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh van » tran van, trinh van, thanh van
van nhung » van nhuong, va nhung, van hung
doc hieu » toc thieu, hoc thieu, hoc hien
van than » van thanh, van thang, van tuan
dan chan » dan gian, dan ca, van chat

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 ((van than) or (dan chan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh van nhung cong ((van than) OR (dan chan)) tap.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh van nhung cong ((van than) or (dan chan)) tap*.