Perhaps you should try some spelling variations:
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
cac xuc » cam xuc, cac nuoc, chat xuc
va hanh » van hanh, va thanh, dao hanh
va danh » va dinh, va dan, dia danh
qua cac » cua cac
tang ma » mang may, tang van
ky tang » ky nang, ky dang, kho tang
cai ky » cao ky, cac ky, cam ky
ma hoi » mai hoi, xa hoi, ma hoa
ca cua » co cua
tu cai » tu cac, tu can, tu bai

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