Perhaps you should try some spelling variations:
hoc sach » hoc cac, hoc anh
cham tuc » nham thuc, pham thuc, tham thuc
va cham » va chat, va tham
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
cua tre » cua te, cuu tre, cua triet
di cua » dai cua, doi cua, de cua
x hoi » xa hoi, o hoi, x ho

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 sach) OR (hoc sinh)) ky nang x hoi. lieu va cham tuc ((va danh) OR (va hanh)) di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) OR (hoc sinh)) ky nang x hoi. lieu va cham tuc ((va danh) or (va hanh)) di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) OR (hoc sinh)) ky nang x hoi. lieu va cham tuc ((va danh) or (va hanh)) di cua tre*.