Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach thu » sach thue, sach thieu, sach tham
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cuu tre, cua triet
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
tuc va » truc va, tuc xa, duc va
di cua » dai cua, doi cua, de cua
va cam » va cham, va cac, va cao

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 thu ((nang xa) or (nang ma)) hoi. lieu va cam ((tuc va) or (thuc va)) hanh di cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach thu ((nang xa) OR (nang ma)) hoi. lieu va cam ((tuc va) OR (thuc va)) hanh di cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach thu ((nang xa) or (nang ma)) hoi. lieu va cam ((tuc va) or (thuc va)) hanh di cua tre*.