Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh dai » danh dau, danh di, danh sai
xa nang » da nang, xa nong, ca nang
va nang » van nang, da nang, cam nang
cam duc » cam xuc, cao duc, pham duc
va danh » va dinh, va dan, va hanh
va cam » va cham, va cac, va cao
cua te » cua tu
x hoi » xa hoi, x ho, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((xa nang) or (va nang)) ((x hoi) OR (o hoi)). lieu va cam duc va danh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((xa nang) OR (va nang)) ((x hoi) OR (o hoi)). lieu va cam duc va danh dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((xa nang) or (va nang)) ((x hoi) OR (o hoi)). lieu va cam duc va danh dai cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((xa nang) or (va nang)) ((x hoi) OR (o hoi)). lieu va cam duc va danh dai cua te*.