Perhaps you should try some spelling variations:
nhuong cong » nhung cong, luong cong, thong cong
duong cong » dung cong, luong cong, duong trong
hieu xanh » chieu xanh, hieu manh, hieu nganh
tranh van » tran van, trinh van, thanh van
van thanh » ban thanh, van tuan
doc hieu » toc thieu, hoc thieu, hoc hien
van phan » van phong, luan phan, van ban

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