Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
ve pham » vi pham, v pham, ve phat
ve phan » va phan, ke phan, ve phat
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
vai cua » dai cua, hai cua, lai cua
y nang » ky nang, ly nang, v nang
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: co sach y nang x hoi. hieu ((ve pham) OR (ve phan)) duc ((va danh) or (va hanh)) vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach y nang x hoi. hieu ((ve pham) OR (ve phan)) duc ((va danh) OR (va hanh)) vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "co sach y nang x hoi. hieu ((ve pham) OR (ve phan)) duc ((va danh) or (va hanh)) vai cua te".
• Adding a wildcard symbol may retrieve word variants: co sach y nang x hoi. hieu ((ve pham) OR (ve phan)) duc ((va danh) or (va hanh)) vai cua te*.