Perhaps you should try some spelling variations:
chat duc » chat xuc, chat doc, chet duoc
ban hanh » ban hang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu san, tu bac
ma hoi » xa hoi, ma hoa, me 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) OR (tu cac)) ky nang ((ma hoi) or (mai hoi)). hieu va chat duc ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu cac)) 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 cac)) 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 cac)) ky nang ((ma hoi) or (mai hoi)). hieu va chat duc ban hanh vi cua tre*.