Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nam thuoc » nam thu, nha thuoc, cay thuoc
toc sach » hoc sach, doc sach, nuoc sach
nam thuc » am thuc, nam thu, nam tu
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
va dan » ca dan, va dao, va dau
dan va » doan va, dan ca, ban va
va cua » va chua, via cua, ca cua

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) OR (thuoc sach)) y lang xa hoi. hieu va ((nam thuc) OR (nam thuoc)) va dan va cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (thuoc sach)) y lang xa hoi. hieu va ((nam thuc) or (nam thuoc)) va dan va cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (thuoc sach)) y lang xa hoi. hieu va ((nam thuc) or (nam thuoc)) va dan va cua tre*.