Perhaps you should try some spelling variations:
sach thue » sach thu, sach thieu, sach tham
vanh dai » van dai, vanh tai, lanh dao
cam tuc » cam xuc, cam tu, nam thuc
xa vanh » xa vinh, xa van, xa thanh
cua tre » cua te, cuu tre, cua triet
co hai » co dai, co hoi, so hai
va cam » va cham, va cac, va cao
o hai » so hai, o lai, _ hai

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: tu ((sach y) OR (sach thue)) nang ((co hai) OR (o hai)). lieu va cam tuc xa vanh dai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach y) or (sach thue)) nang ((co hai) OR (o hai)). lieu va cam tuc xa vanh dai cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sach thue)) nang ((co hai) OR (o hai)). lieu va cam tuc xa vanh dai cua tre*.