Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
cay dua » chay dua, cay lua, cay nua
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
vai cua » dai cua, hai cua, lai cua
ca dua » ca cua, ca da, ca lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky sang ma hoa. hieu va ((ca dua) OR (cay dua)) ban thanh ((vai cua) or (lai chau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky sang ma hoa. hieu va ((ca dua) OR (cay dua)) ban thanh ((vai cua) OR (lai chau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky sang ma hoa. hieu va ((ca dua) OR (cay dua)) ban thanh ((vai cua) or (lai chau)) tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky sang ma hoa. hieu va ((ca dua) OR (cay dua)) ban thanh ((vai cua) or (lai chau)) tre*.