Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hoc sach » hoc sinh, hoc cac, hoc anh
cam cuc » cam xuc, cham cuu, pham cuc
hai cua » thai cua, hoi cua, lai cua
cuc ban » cua ban, cac ban, cuu ban
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ve cam » ve cham, ve cac, va cam
y dang » ky dang, _ dang, b dang
2 dang » 2 danh, _ dang, b dang

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: hoc sach ((y dang) OR (2 dang)) mai hoi. hieu ve cam cuc ban thanh ((dai cua) OR (hai cua)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach ((y dang) OR (2 dang)) mai hoi. hieu ve cam cuc ban thanh ((dai cua) or (hai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: hoc sach ((y dang) OR (2 dang)) mai hoi. hieu ve cam cuc ban thanh ((dai cua) or (hai cua)) tre*.