Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vai cua » dai cua, hai cua, lai cua
va dinh » van dinh, va kinh, va tinh
va danh » va dan, va hanh, dia danh
va chat » van chat, va phat, cao chat
va cham » va tham
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
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: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc ((va danh) or (va dinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc ((va danh) OR (va dinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc ((va danh) or (va dinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc ((va danh) or (va dinh)) vai cua tre*.