Perhaps you should try some spelling variations:
cuon sach » duong sach, cuoc cach, co sach
ty nang » ky nang, ty hang, ly nang
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
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.

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