Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
dang xay » dang van, van xay
toc sach » hoc sach, doc sach, thuoc sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, lang van
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
thuc » thu

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