Perhaps you should try some spelling variations:
duong trong » dung trong
dang thanh » dong thanh, dang hanh, hoang thanh
cang thang » cong thanh
thanh chau » thanh cha, thanh cham, thanh chu
hieu manh » chieu xanh, hieu nganh, dieu hanh
trong van » trong cac
thanh cau » thanh mau, nhanh cau, thanh ca
hoc hieu » hoc thieu, hoc hien, doc hieu
va duong » van duong, va tuong, va huong

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 - ((cang thang) OR (dang thanh)) va duong trong van ((thanh cau) OR (thanh chau))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - ((cang thang) OR (dang thanh)) va duong trong van ((thanh cau) or (thanh chau))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - ((cang thang) OR (dang thanh)) va duong trong van ((thanh cau) or (thanh chau))*.