Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ly » sach y, sach lo, sach ty
tay hoi » tay ho, tao hoi, tay thai
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
va tay » va thay, van tay, ha tay
xuc va » duc va, tuc va, luc va
anh va » hanh va
va cua » va chua, via cua, ca 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 ly va tay hoi. hieu van nam ((xuc va) or (thuc va)) anh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ly va tay hoi. hieu van nam ((xuc va) OR (thuc va)) anh va cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ly va tay hoi. hieu van nam ((xuc va) or (thuc va)) anh va cua tre*.