Perhaps you should try some spelling variations:
tranh luan » trinh luan, trinh luat, doanh luan
luan chung » luan chinh
chung cong » nhung cong, chong cong, phung cong
hieu xanh » chieu xanh, hieu manh, hieu nganh
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
dan toan » van toan, dan than, xuan toan

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 luan chung cong ((dan toan) OR (manh toan)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - canh tranh luan chung cong ((dan toan) OR (manh toan)) cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh luan chung cong ((dan toan) OR (manh toan)) cau*.