Perhaps you should try some spelling variations:
nam thuoc » nha thuoc, cay thuoc, va thuoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » am thuc, nam tu
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
van tai » von tai, van tuan
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet

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 ky lang xa hoi. hieu va ((((nam thuc) or (nam thu))) or (nam thuoc)) va van tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu va ((((nam thuc) OR (nam thu))) OR (nam thuoc)) va van tai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu va ((((nam thuc) or (nam thu))) or (nam thuoc)) va van tai cua tre*.