Perhaps you should try some spelling variations:
ban doanh » van doanh, san doanh, ban danh
kho tang » cao tang
cua tre » cua te, cuu tre, cua triet
tai cua » thai cua, tai cuc, tri cua
duc ban » duc tan, duc van, dua ban
cam duc » cam xuc, cao duc, pham duc
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
su can » su van, su cao, tu can
su cac » tu cac, su cao, eu cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su cac) or (su can)) ((ky tang) or (kho tang)) ma hoi. hieu ve cam duc ban doanh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su cac) OR (su can)) ((ky tang) OR (kho tang)) ma hoi. hieu ve cam duc ban doanh tai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((su cac) or (su can)) ((ky tang) or (kho tang)) ma hoi. hieu ve cam duc ban doanh tai cua tre*.