Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
vu sach » su sach, vu khach
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
xa hanh » xa thanh, xa khanh, va hanh
co hoi » co hoc, co loi
vi cua » vai cua, di cua
cua te » cua tu

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: ((vu sach) OR (vu bach)) ky nang ((x ho) OR (co hoi)). hieu van cac tuc xa hanh vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu bach)) ky nang ((x ho) or (co hoi)). hieu van cac tuc xa hanh vi cua te~".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu bach)) ky nang ((x ho) or (co hoi)). hieu van cac tuc xa hanh vi cua te*.