Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
cua tre » cuu tre, cua triet, dua tren
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
va chat » van chat, va phat, cao chat
va cham » va tham
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 (va chat)) xuc va danh vi ((cua 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 (va chat)) xuc va danh vi ((cua tre) OR (cua te)).
• 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 vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang x hoi. hieu ((va cham) OR (va chat)) xuc va danh vi ((cua tre) or (cua te))*.