Perhaps you should try some spelling variations:
hanh tranh » canh tranh, hanh trinh, hanh trang
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
doc hieu » hoc thieu, hoc hien
tranh ha » thanh ha, trang ha, trinh ha
dan toan » van toan, dan than, xuan toan
ha tong » han tong, ha dong, ha tang

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) OR (toc thieu)) manh - hanh tranh ha tong cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc hieu) OR (toc thieu)) manh - hanh tranh ha tong cong ((dan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc hieu) OR (toc thieu)) manh - hanh tranh ha tong cong ((dan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: ((doc hieu) OR (toc thieu)) manh - hanh tranh ha tong cong ((dan toan) or (manh toan)) cao*.