Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
vai cua » dai cua, hai cua, lai cua
sach ly » sach y, sach lo, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ly nang » ky nang, ly hang, ly vang
cac lo » cac lop, cac co, cac bo
me hoi » le hoi
ve cac » va cac, vien cac

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 ly nang ((me hoi) or (ma hoa)). hieu ve cac lo ((ban hanh) or (ngan hang)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly nang ((me hoi) OR (ma hoa)). hieu ve cac lo ((ban hanh) OR (ngan hang)) vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ly nang ((me hoi) or (ma hoa)). hieu ve cac lo ((ban hanh) or (ngan hang)) vai cua tre*.