Perhaps you should try some spelling variations:
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
hoc hieu » hoc thieu, hoc hien, doc hieu
tung can » trung can, tung dan, trung cap
can bang » cao bang, can ban, van ban
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu manh - thanh tung can bang phuong ((dan toan) OR (dan than)) cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - thanh tung can bang phuong ((dan toan) OR (dan than)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - thanh tung can bang phuong ((dan toan) OR (dan than)) cau*.