Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
ky dang » ky nang, ky danh
van cam » van nam, van lam, van cau
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, dua tren
y dang » 2 dang, _ dang, b dang
xuc va » duc va, tuc va, luc va
cua te » cua tu

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