Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
toc sach » hoc sach, doc sach, nuoc sach
nam thuc » nam thuoc, am thuc, nam thu
cuu tre » cau tren, cau treo
dan vai » dan va, dan tai, dan vat
thuc va » thuc vat, thuc dan, thuc day
cua tre » cua te, cua triet, dua tren
hieu va » lieu va, hieu qua
va dan » ca dan, va dao, va dau
va nam » van nam, ha nam, va nay
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: ((toc sach) or (thuoc sach)) ky nang x hoi. hieu va nam thuc va dan vai ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuoc sach)) ky nang x hoi. hieu va nam thuc va dan vai ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuoc sach)) ky nang x hoi. hieu va nam thuc va dan vai ((cuu tre) or (cua tre))*.