Perhaps you should try some spelling variations:
ban hanh » ban hang
soc ban » hoc ban, coc ban, so ban
hieu va » lieu va, hieu qua
sach ty » sach y, sach thu, xach tay
hieu vu » hieu ve, hieu su, dieu vu
xang xa » lang xa, mang xa, ang xa
sach tu » sach thu, cach tu, sach uu
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach tu)) xang xa hoi. ((hieu vu) OR (hieu va)) cham soc ban hanh vi cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) OR (sach tu)) xang xa hoi. ((hieu vu) or (hieu va)) cham soc ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach tu)) xang xa hoi. ((hieu vu) or (hieu va)) cham soc ban hanh vi cua tre*.