Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cham hoc » cham soc, chat hoc, cham hoi
anh vai » anh bai, anh van, anh tai
hoc van » hoc dan, hoc va, hoc vat
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
anh va » hanh va

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 ((anh vai) OR (anh va)) 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 ((anh vai) OR (anh va)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang xa hoi. hieu va cham hoc van ((anh vai) OR (anh va)) cua tre*.