Perhaps you should try some spelling variations:
cang thang » cong thanh, dang thanh
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, hung thang, lang thang
thanh cau » thanh chau, thanh mau, nhanh cau
hoc hieu » hoc thieu, hoc hien, doc hieu
cong tan » cong tac, cong san, cong thanh
song van » hoang van, trong van, duong van
va dung » van dung, va duong, vat dung

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - ((hang hang) OR (cang thang)) va dung ((cong tan) OR (song van)) thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((hang hang) OR (cang thang)) va dung ((cong tan) or (song van)) thanh cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((hang hang) OR (cang thang)) va dung ((cong tan) or (song van)) thanh cau*.