Perhaps you should try some spelling variations:
ban hang » ngan hang
so sach » so sanh, bo sach, co sach
ky sang » ky nang, ky tang, duy sang
ky dang » ky nang, ky danh
lam duc » lam duoc, pham duc, nam duoc
duc ban » duc tan, duc van, dua ban
hang ca » hang va, nang cao, hang tai
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
va lam » van lam, va lap
ca cua » co cua

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 ((ky sang) or (ky dang)) ma hoi. lieu va lam duc ban hang ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ky sang) OR (ky dang)) ma hoi. lieu va lam duc ban hang ca cua tre.
• Adding a wildcard symbol may retrieve word variants: so sach ((ky sang) or (ky dang)) ma hoi. lieu va lam duc ban hang ca cua tre*.