Perhaps you should try some spelling variations:
ban hanh » ban hang
nang ma » tang ma, sang ma, nang cao
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
va danh » va dinh, va dan, va hanh
cua tre » cua te, cuu tre, cua triet
tu sai » tu san, tu cai, tu lai
tu bai » tu ban, tu bat, te bai
ca cua » co 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 sai) OR (tu bai)) ky nang ma hoa. hieu qua cac xuc ((va danh) or (ban hanh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sai) OR (tu bai)) ky nang ma hoa. hieu qua cac xuc ((va danh) OR (ban hanh)) ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sai) OR (tu bai)) ky nang ma hoa. hieu qua cac xuc ((va danh) or (ban hanh)) ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sai) OR (tu bai)) ky nang ma hoa. hieu qua cac xuc ((va danh) or (ban hanh)) ca cua tre*.