Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hang » ngan hang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
ma hoi » mai hoi, xa hoi, ma hoa
va dao » ca dao

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 y nang ma hoi. hieu ((va cam) or (va dao)) tuc ((ban hang) or (gia thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu ((va cam) OR (va dao)) tuc ((ban hang) OR (gia thanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu ((va cam) or (va dao)) tuc ((ban hang) or (gia thanh)) hai cua tre*.