Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va cham » va chat, va tham
va dinh » van dinh, va kinh, va tinh
dinh vi » dinh ve, dinh viet, dinh tri
cuu tre » cua tre, cau tren, cau treo
y nang » ky nang, ly nang, v nang
xuc va » duc va, tuc va, luc va
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: toc sach y nang x hoi. hieu ((va cham) or (cao chat)) xuc va dinh vi ((cuu tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang x hoi. hieu ((va cham) OR (cao chat)) xuc va dinh vi ((cuu tre) OR (cua te)).
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((va cham) or (cao chat)) xuc va dinh vi ((cuu tre) or (cua te))*.