Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cao

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

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