Perhaps you should try some spelling variations:
cay phoi » cap phoi, tay hoi, cay cho
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
van cam » van nam, van lam, van cau
cua tre » cua te, cuu tre, cua triet
xay hoi » xa hoi, tay hoi, gay thoi
ty dang » ty xang, ky dang, ty hang
luc va » duc va, tuc va, loc va
vi cua » vai cua, di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) or (toc sach)) ty dang ((xay hoi) OR (cay phoi)). hieu van cam luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty dang ((xay hoi) OR (cay phoi)). hieu van cam luc va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ty dang ((xay hoi) OR (cay phoi)). hieu van cam luc va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ty dang ((xay hoi) OR (cay phoi)). hieu van cam luc va hanh vi cua tre*.