Perhaps you should try some spelling variations:
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
sach ky » sac ky, sach ty, sach kem
vai cua » dai cua, hai cua, lai cua
dua ban » dia ban, cua ban, qua ban
cau dua » cau qua, cau cua, ca dua
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
va cau » van cau, va cac, va dau
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) or (sach y)) nang ((ma hoi) or (ma hoa)). hieu va cau dua ban hang vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang ((ma hoi) OR (ma hoa)). hieu va cau dua ban hang vai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang ((ma hoi) or (ma hoa)). hieu va cau dua ban hang vai cua tre*.