Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hai » thanh phan, thanh hoa, thanh san
sach thu » sach thue, sach thieu, sach tham
hai cua » thai cua, dai cua, hoi cua
cuc ban » cua ban, cac ban, cuu ban
sach tu » cach tu, sach ty, sach uu
dang ma » dang mau, dang mam, dang mat
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cao, va cai
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach tu) OR (sach thu)) dang ma hoi. hieu ((va cam) or (va cac)) cuc ban thanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach tu) OR (sach thu)) dang ma hoi. hieu ((va cam) OR (va cac)) cuc ban thanh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach tu) OR (sach thu)) dang ma hoi. hieu ((va cam) or (va cac)) cuc ban thanh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach tu) OR (sach thu)) dang ma hoi. hieu ((va cam) or (va cac)) cuc ban thanh hai cua tre*.