Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thai cua » than cua, tai cuc, tri cua
hai cua » dai cua, hoi cua, lai cua
soc ban » hoc ban, coc ban, so ban
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va
tang ha » lang ha, tang ma, trung ha
ky tang » ky nang, ky dang, kho tang

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: te sach ky tang ha noi. ((hieu ve) OR (hieu van)) cham soc ban thanh ((hai cua) OR (thai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang ha noi. ((hieu ve) or (hieu van)) cham soc ban thanh ((hai cua) OR (thai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang ha noi. ((hieu ve) or (hieu van)) cham soc ban thanh ((hai cua) OR (thai cua)) tre*.