Perhaps you should try some spelling variations:
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
may hoi » may thoi, tay hoi, mai hoi
ky mang » ky nang, ke mang, ky dang
tu can » tu ban, tu cac, thu canh
ca cua » co cua
tu cai » tu cac, tu bai, tu cay

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cai) OR (tu can)) ky mang may hoi. hieu qua cac xuc ((va danh) or (va hanh)) ca cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cai) OR (tu can)) ky mang may hoi. hieu qua cac xuc ((va danh) OR (va hanh)) ca cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cai) OR (tu can)) ky mang may hoi. hieu qua cac xuc ((va danh) or (va hanh)) ca cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cai) OR (tu can)) ky mang may hoi. hieu qua cac xuc ((va danh) or (va hanh)) ca cua tre*.