Perhaps you should try some spelling variations:
thuc day » thuc dan, thuc vat
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang co » nang cao, nang doc, nang noi
thuc va » thuc vat, thuc dan
co hai » co dai, co hoi, o hai
cua te » cua tu
va am » va lam, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang co hai. lieu va am ((thuc va) OR (thuc day)) hanh dai cua te~.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang co hai. lieu va am ((thuc va) or (thuc day)) hanh dai cua te*.