Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, van anh, van ban
ban hanh » ban hang
sach ty » sach y, sach tu, sach thu
va hanh » va thanh, va danh, dao hanh
hai cua » thai cua, dai cua, hoi cua
xang x » nang x
va dam » van dam, va dao, va dau
dam tu » nam tu, cam tu, tam tu
cua te » cua 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: toc sach ty xang x hoi. lieu va dam tu ((va hanh) OR (((van hanh) OR (ban hanh)))) hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ty xang x hoi. lieu va dam tu ((va hanh) or (((van hanh) OR (ban hanh)))) hai cua te~".
• Adding a wildcard symbol may retrieve word variants: toc sach ty xang x hoi. lieu va dam tu ((va hanh) or (((van hanh) OR (ban hanh)))) hai cua te*.