Perhaps you should try some spelling variations:
nha thuoc » nha nuoc, nhan thuc, nha hoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, 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
dan dai » dat dai, can dai, dan dat
dai cuu » dai cua, dai huu
cuu tre » cua tre, cau tren, cau treo
va dan » ca dan, va dao, va dau

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