Perhaps you should try some spelling variations:
ban hanh » ban hang
sach thu » sach thue, sach thieu, sach tham
hieu su » hieu sau, tieu su, hieu so
soc ban » hoc ban, coc ban, so ban
hieu vu » hieu va, hieu ve, dieu vu
sach ty » sach y, sach tu, xach tay
lang xa » lang ha, dang xay, lang van
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.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ty) OR (sach thu)) lang xa hoi. ((hieu vu) or (hieu su)) cham soc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) lang xa hoi. ((hieu vu) OR (hieu su)) 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 thu)) lang xa hoi. ((hieu vu) or (hieu su)) cham soc ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) OR (sach thu)) lang xa hoi. ((hieu vu) or (hieu su)) cham soc ban hanh vi cua tre*.