Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
tay lang » tai lang, tay tang, tay quang
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
te sach » toc sach
hieu va » lieu va, hieu qua
dao lai » dao lam, dao bai, dao hai
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
y lang » o lang, _ lang, yen lang
va dao » ca dao

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: ((thu sach) OR (te sach)) ((y lang) OR (tay lang)) xa hoi. hieu va cac nuoc va dao lai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ((y lang) OR (tay lang)) xa hoi. hieu va cac nuoc va dao lai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ((y lang) OR (tay lang)) xa hoi. hieu va cac nuoc va dao lai cua tre*.