Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
cham tuc » nham thuc, pham thuc, cham soc
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
ty nang » ky nang, ty xang, ty hang
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: ((te sach) OR (hoc sach)) ty nang x hoi. hieu va ((cham tuc) OR (tham thuc)) van hanh di cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ty nang x hoi. hieu va ((cham tuc) OR (tham thuc)) van hanh di cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) ty nang x hoi. hieu va ((cham tuc) OR (tham thuc)) van hanh di cua tre*.