Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
qua cham » qua hai, qua cac, va cham
nang xa » nang x, lang xa, nang ma
sach tu » sach thu, cach tu, sach ty
hanh di » hanh vi, hanh de, hang di
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
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 tu ((nang xa) or (dang xay)) hoi. hieu qua cham ((xuc va) or (luc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu ((nang xa) OR (dang xay)) hoi. hieu qua cham ((xuc va) OR (luc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu ((nang xa) or (dang xay)) hoi. hieu qua cham ((xuc va) or (luc va)) hanh di cua tre*.