Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
te sach » toc sach
cam tuc » cam xuc, cam tu, nam thuc
hai cua » thai cua, dai cua, hoi cua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
sang ma » tang ma, nang ma, sang tao
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
v sang » va sang, ve sang, _ sang

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (hoc sach)) v sang ma hoi. hieu va cam tuc ((ban thanh) or (gia thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) v sang ma hoi. hieu va cam tuc ((ban thanh) OR (gia thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (hoc sach)) v sang ma hoi. hieu va cam tuc ((ban thanh) or (gia thanh)) hai cua tre*.