Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
danh ca » dan ca, doanh cua, danh gia
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang

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 ky sang ma hoa. thien ((danh ca) or (danh cho)) dua ((ban thanh) OR (ban hang)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoa. thien ((danh ca) OR (danh cho)) dua ((ban thanh) OR (ban hang)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky sang ma hoa. thien ((danh ca) or (danh cho)) dua ((ban thanh) OR (ban hang)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoa. thien ((danh ca) or (danh cho)) dua ((ban thanh) OR (ban hang)) hai cua tre*.