Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh ca » thanh cha, thanh cac, thanh ha
so sach » bo sach, co sach, hoc sach
duc ban » duc tan, duc van, dua ban
lam duc » lam duoc, pham duc, nam duoc
cua tre » cua te, cuu tre, cua triet
ky dang » ky nang, ky danh
ky sang » ky nang, ky tang, duy sang
so sanh » do sanh
va lam » van lam, va lap
ca cua » co cua
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: ((so sach) OR (so sanh)) ((ky sang) or (ky dang)) ma hoi. lieu va lam duc ban thanh ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ((ky sang) OR (ky dang)) ma hoi. lieu va lam duc ban thanh ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) ((ky sang) or (ky dang)) ma hoi. lieu va lam duc ban thanh ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) ((ky sang) or (ky dang)) ma hoi. lieu va lam duc ban thanh ca cua tre*.