Perhaps you should try some spelling variations:
hieu manh » chieu xanh, hieu nganh, dieu hanh
hang hang » nang hang, cang thang, hung thang
trong van » trong cac
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, duong van, dang 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 va dung ((cong tan) OR (((song van) OR (trong van)))) thanh cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - hang hang va dung ((cong tan) or (((song van) OR (trong van)))) thanh cau~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - hang hang va dung ((cong tan) or (((song van) OR (trong van)))) thanh cau*.