Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
nam thuc » nam thuoc, nam thu, nam tu
lang xa » lang ha, dang xay, lang van
hieu ha » hieu hoa, hieu va, hieu ca
dan vai » dan va, dan tai, dan vat
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, tay lang
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 y lang xa hoi. hieu ha ((nam thuc) or (am thuc)) va dan vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y lang xa hoi. hieu ha ((nam thuc) OR (am thuc)) va dan vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach y lang xa hoi. hieu ha ((nam thuc) or (am thuc)) va dan vai cua tre*.