Perhaps you should try some spelling variations:
ban hanh » ban hang
chat duc » chat xuc, chat doc, chet duoc
cua tre » cua te, cuu tre, cua triet
duc ban » duc tan, duc van, dua ban
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ma hoi » xa hoi, ma hoa, me hoi
tu san » thu san, tu ban, tu can
vi cua » vai cua, di cua
tu sac » tu sach, tu cac, tu bac

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

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