Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, hanh dao, vanh dai
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cam tuc » cam xuc, nam thuc, dam thuc
te sach » toc sach
cua tre » cua te, cuu tre, cua triet
cam tu » cam thu, nam tu, dam tu
x hoi » xa hoi, o hoi, x ho

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)) ky nang x hoi. hieu van ((cam tuc) OR (cam tu)) ban hanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky nang x hoi. hieu van ((cam tuc) OR (cam tu)) ban hanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky nang x hoi. hieu van ((cam tuc) OR (cam tu)) ban hanh dai cua tre*.