Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh hoa » thanh pho
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
cam duc » cam xuc, cao duc, pham duc
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
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: su sach ky sang ma hoi. lieu va ((cam duc) or (giao duc)) ban thanh hoa ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky sang ma hoi. lieu va ((cam duc) OR (giao duc)) ban thanh hoa ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky sang ma hoi. lieu va ((cam duc) or (giao duc)) ban thanh hoa ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky sang ma hoi. lieu va ((cam duc) or (giao duc)) ban thanh hoa ((cua tre) OR (cuu tre))*.