Perhaps you should try some spelling variations:
nam thuoc » nha thuoc, cay thuoc, va thuoc
toc sach » hoc sach, doc sach, thuoc sach
dang xay » dang van, van xay
nam thuc » am thuc, nam tu
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
xay hoi » xa hoi, tay hoi, cay phoi
dan vai » dan va, dan tai, dan vat
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
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 dang xay hoi. hieu qua ((nam thuc) OR (((nam thuoc) OR (nam thu)))) va dan vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. hieu qua ((nam thuc) or (((nam thuoc) OR (nam thu)))) va dan vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. hieu qua ((nam thuc) or (((nam thuoc) OR (nam thu)))) va dan vai cua tre*.