Perhaps you should try some spelling variations:
nam thuoc » nam thu, cay thuoc, va thuoc
nha thuoc » nha nuoc, nhan thuc, nha hoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » am thuc, nam thu, nam tu
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
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 tang xa hoi. hieu va ((nam thuc) or (((nam thuoc) or (nha thuoc)))) va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky tang xa hoi. hieu va ((nam thuc) OR (((nam thuoc) OR (nha thuoc)))) va dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ky tang xa hoi. hieu va ((nam thuc) or (((nam thuoc) or (nha thuoc)))) va dan dai cua tre*.