Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
cua tre » cua te, cuu tre, cua triet
qua cac » cua cac
cac xuc » cam xuc, cac nuoc, chat xuc
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, xa hoi, me hoi
sai ky » sac ky
va dan » ca dan, va dao, va dau
ca cua » co cua
tu sai » tu bai, tu san, tu cai

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