Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
xuc ban » duc ban, cuc ban, quoc ban
qua cac » cua cac
cua tre » cua te, cuu tre, cua triet
qua cam » qua cham, qua ca, qua cai
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
di cua » dai cua, doi cua, de cua

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) or (nang ma)) hoi. hieu ((qua cam) or (qua cac)) xuc ban hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((nang xa) OR (nang ma)) hoi. hieu ((qua cam) OR (qua cac)) xuc ban hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((nang xa) or (nang ma)) hoi. hieu ((qua cam) or (qua cac)) xuc ban hanh di cua tre*.