Perhaps you should try some spelling variations:
ban thanh » ban hang
ty chang » ty hang, ty chung, thi chang
chang xu » chang xue, chao xu, thong xu
ban hanh » ban hang
te sach » toc sach
day cua » dai cua
sach ty » sach y, sach tu, sach thu
cua te » cua tu
va cao » va cac, va co, va dao
va cam » va cham, va cac, va cai
xu hoi » xa hoi, lu hoi, vu hoi

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 ty chang xu hoi. hieu ((va cam) OR (va cao)) cuc ((ban thanh) OR (ban hanh)) day cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty chang xu hoi. hieu ((va cam) or (va cao)) cuc ((ban thanh) OR (ban hanh)) day cua te~".
• Adding a wildcard symbol may retrieve word variants: te sach ty chang xu hoi. hieu ((va cam) or (va cao)) cuc ((ban thanh) OR (ban hanh)) day cua te*.