Perhaps you should try some spelling variations:
ban hanh » ban hang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve chay » ve chat, de chay, ve cham
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » xa hoi, me hoi, va hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang ((((ma hoi) OR (ma hoa))) or (mai hoi)). hieu ve chay dua ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((((ma hoi) OR (ma hoa))) OR (mai hoi)). hieu ve chay dua ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ((((ma hoi) OR (ma hoa))) or (mai hoi)). hieu ve chay dua ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((((ma hoi) OR (ma hoa))) or (mai hoi)). hieu ve chay dua ban hanh vi cua tre*.