Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh dai » danh dau, danh di, danh sai
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
te cac » tu cac, ve cac, te cao
x hoi » xa hoi, o hoi, x ho
va am » va lam, va cam

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) or (te cac)) ky nang x hoi. hieu va am thuc va danh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (te cac)) ky nang x hoi. hieu va am thuc va danh dai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (te cac)) ky nang x hoi. hieu va am thuc va danh dai cuu tre*.