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
nang ma » tang ma, sang ma, nang cao
van cam » van nam, van lam, van cau
danh de » hanh de, dan de, dang de
cua tre » cua te, cuu tre, cua triet
xuc va » tuc va, luc va, xac va
de cua » le cua, te cua, dieu 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 (nang ma)) hoi. hieu van cam ((xuc va) OR (duc va)) danh de cua tre~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty ((nang x) or (nang ma)) hoi. hieu van cam ((xuc va) or (duc va)) danh de cua tre*.