Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai
tuc va » thuc va, truc va, tuc xa
vi cua » vai cua, di 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 y ((nang xa) or (nang ma)) hoi. lieu ((va cam) or (va cac)) tuc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y ((nang xa) OR (nang ma)) hoi. lieu ((va cam) OR (va cac)) tuc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y ((nang xa) or (nang ma)) hoi. lieu ((va cam) or (va cac)) tuc va hanh vi cua tre*.