Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh vai » hanh vi, hanh va, hanh tai
ky dang » ky danh
van cam » van lam, van cau, van dam
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
xuc va » duc va, tuc va, luc va

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 ((ky dang) or (ky nang)) ma hoa. hieu ((van cam) OR (van nam)) xuc va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky nang)) ma hoa. hieu ((van cam) OR (van nam)) xuc va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky dang) or (ky nang)) ma hoa. hieu ((van cam) OR (van nam)) xuc va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky nang)) ma hoa. hieu ((van cam) OR (van nam)) xuc va hanh vai cua tre*.