Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
van dinh » van minh, van dich, xuan dinh
ty hang » ly hang, thi hang, thu hang
hieu ve » hieu va, hieu van
va dinh » va kinh, va tinh, vu dinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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 ((ty xang) or (ty hang)) xa hoi. hieu ve cam xuc ((va dinh) OR (van dinh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ty xang) OR (ty hang)) xa hoi. hieu ve cam xuc ((va dinh) OR (van dinh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ty xang) or (ty hang)) xa hoi. hieu ve cam xuc ((va dinh) OR (van dinh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ty xang) or (ty hang)) xa hoi. hieu ve cam xuc ((va dinh) OR (van dinh)) vai cua tre*.