Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » am thuc, nam thu, nam tu
tai cuu » tai cuc, tai buu, tai cua
dan tai » van tai, dan thi, han tai
sach ky » sac ky, sach y, sach ty
hieu va » lieu va
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
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.

• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. ((hieu va) OR (hieu qua)) ((nam thuc) OR (nam thuoc)) va dan tai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. ((hieu va) OR (hieu qua)) ((nam thuc) or (nam thuoc)) va dan tai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. ((hieu va) OR (hieu qua)) ((nam thuc) or (nam thuoc)) va dan tai cuu tre*.