Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
sach ty » sach y, sach tu, sach thu
sang ma » tang ma, nang ma, sang tao
van cam » van nam, van lam, van cau
xanh di » danh di, vanh dai, xanh tai
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
di cua » dai cua, doi cua, de cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty ((nang x) OR (sang ma)) hoi. hieu van cam ((xuc va) OR (duc va)) xanh di cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang x) or (sang ma)) hoi. hieu van cam ((xuc va) or (duc va)) xanh di cua tre*.