Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham hoc » cham soc, chat hoc, cham hoi
toc sach » hoc sach, doc sach, thuoc sach
van hanh » ban hanh, van anh, van ban
vai cua » dai cua, hai cua, lai cua
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet

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 (toc sach)) ty nang xa hoi. hieu va cham hoc ((van hanh) OR (van thanh)) vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty nang xa hoi. hieu va cham hoc ((van hanh) OR (van thanh)) vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang xa hoi. hieu va cham hoc ((van hanh) OR (van thanh)) vai cua tre*.