Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cao thuc » cao thuoc, bao thuc, can thuc
hanh dai » hanh tai, hanh dao, vanh dai
ty nang » ky nang, ty xang, ty hang
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cao » va cac, va co, va dao
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty nang x hoi. lieu va cao thuc va hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang x hoi. lieu va cao thuc va hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty nang x hoi. lieu va cao thuc va hanh dai cua tre*.