Perhaps you should try some spelling variations:
mai khoi » mai khoa, tai khoa, cac khoi
ban hang » ngan hang
hang dai » hoang dai, hang tai, hang dau
ky tang » ky nang, ky dang, kho tang
mai hoi » dai hoi, lai hoi, mai doi
hieu va » lieu va, hieu qua
cam duc » cam xuc, cao duc, pham duc
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
su sai » su tai, su hai, su dai
sai ky » sac ky
va cam » va cham, va cac, va cao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky tang ((xa hoi) or (((mai hoi) or (mai khoi)))). hieu va cam duc ban hang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang ((xa hoi) OR (((mai hoi) OR (mai khoi)))). hieu va cam duc ban hang dai cua tre.
• Adding a wildcard symbol may retrieve word variants: su sai ky tang ((xa hoi) or (((mai hoi) or (mai khoi)))). hieu va cam duc ban hang dai cua tre*.