Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sinh dai » sinh thai, si dai, sinh vat
van sinh » van minh, va sinh, van dinh
va thanh » gia thanh, ban thanh, va tinh
tuc van » thuc van, truc van, tuc va
va tham » van tham, va cham, va thuat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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 ty nang ((ma hoi) or (ma hoa)). lieu ((va tham) or (va thanh)) tuc van sinh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((ma hoi) OR (ma hoa)). lieu ((va tham) OR (va thanh)) tuc van sinh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((ma hoi) or (ma hoa)). lieu ((va tham) or (va thanh)) tuc van sinh dai cua tre*.