Perhaps you should try some spelling variations:
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
xang xa » lang xa, mang xa, ang xa
hieu vu » hieu ve, hieu su, hieu qua
dieu vu » dien vu, dieu va, dieu cua
hieu va » lieu va, hieu qua
soc ban » hoc ban, coc ban, so ban
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 xang xa hoi. ((((hieu vu) OR (dieu 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 xang xa hoi. ((((hieu vu) OR (dieu vu))) or (hieu va)) cham soc ban hanh vi cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty xang xa hoi. ((((hieu vu) OR (dieu vu))) or (hieu va)) cham soc ban hanh vi cua tre*.