Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » doc sach, thuoc sach, nuoc sach
nam thuc » am thuc, nam thu, nam tu
hoc sach » hoc sinh, hoc cac, hoc anh
vai cua » dai cua, hai cua, lai cua
dan vai » dan va, dan tai, dan vat
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky 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) OR (hoc sach)) ky lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) ky lang xa hoi. lieu va ((nam thuc) OR (nam thuoc)) va dan vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (hoc sach)) ky lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va dan vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (hoc sach)) ky lang xa hoi. lieu va ((nam thuc) or (nam thuoc)) va dan vai cua tre*.