Perhaps you should try some spelling variations:
hanh thanh » nhanh thanh, thanh thanh, khanh thanh
hieu manh » chieu xanh, hieu nganh, hien hanh
tong cong » trong cong, cong cong, dung cong
manh toan » thanh toan, anh tuan, tinh toan
thanh ha » thanh hoa, thanh hai, nhanh 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 manh) OR (dieu hanh)) - hanh thanh ha tong cong ((dan toan) or (manh toan)) cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu manh) OR (dieu hanh)) - hanh thanh ha tong cong ((dan toan) OR (manh toan)) cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc ((hieu manh) OR (dieu hanh)) - hanh thanh ha tong cong ((dan toan) or (manh toan)) cao".
• Adding a wildcard symbol may retrieve word variants: doc ((hieu manh) OR (dieu hanh)) - hanh thanh ha tong cong ((dan toan) or (manh toan)) cao*.