Perhaps you should try some spelling variations:
hieu xanh » chieu xanh, hieu manh, hieu nganh
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » toc thieu, hoc thieu, hoc hien
tranh he » trinh he, tranh ha, tinh he
dan toan » van toan, dan than, xuan toan
he tong » he thong, he trong, he cong

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 he tong cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu xanh - canh tranh he tong cong ((dan toan) OR (manh toan)) cao.
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - canh tranh he tong cong ((dan toan) or (manh toan)) cao*.