Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
thieu hanh » thien thanh, thieu khang, thi hanh
manh trung » manh tung, thanh trung, manh hung
thong cong » trong cong, tong cong, thong thong
trung va » truong va, trang va, trung ha
va thong » va thuong, va phuong, he thong
dan toan » dan than, manh toan, xuan toan
van toan » van tuan, van tan, van thanh

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thieu hanh) OR (thien chanh)) - manh trung va thong cong ((dan toan) or (van toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu hanh) OR (thien chanh)) - manh trung va thong cong ((dan toan) OR (van toan)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thieu hanh) OR (thien chanh)) - manh trung va thong cong ((dan toan) or (van toan)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu hanh) OR (thien chanh)) - manh trung va thong cong ((dan toan) or (van toan)) cau*.