Perhaps you should try some spelling variations:
ban hang » ngan hang
hang vai » hang va, hang tai, hang hai
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van hau » van ha, van hai, van hac
van dau » van dao, phan dau
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, me hoi

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 nang ((ma hoi) or (ma hoa)). hieu ((van hau) or (van dau)) dia ban hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (ma hoa)). hieu ((van hau) OR (van dau)) dia ban hang vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) or (ma hoa)). hieu ((van hau) or (van dau)) dia ban hang vai cua tre*.