Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
hanh hai » thanh hai, nhanh hai, hang hai
sach ty » sach y, sach tu, sach thu
hai cua » thai cua, dai cua, hoi cua
va dam » van dam, va dao, va dau
dam tu » nam tu, cam tu, tam tu
tu van » tu va
cua te » cua tu
x hoi » xa hoi, o hoi, 5 hoi

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 ty xang ((x hoi) OR (x ho)). lieu va dam tu van hanh hai cua te~.
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang ((x hoi) or (x ho)). lieu va dam tu van hanh hai cua te*.