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
bai ky » ban ky, sai ky, bac ky
va dan » ca dan, va dao, va dau
co cua » con cua, ca cua, cong cua
tu bai » tu ban, tu bat, te 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 bai ky sang ((ma hoi) or (ma hoa)). hieu qua cac xuc ((va dan) or (va thanh)) co cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu bai ky sang ((ma hoi) OR (ma hoa)). hieu qua cac xuc ((va dan) OR (va thanh)) co cua tre.
• Adding a wildcard symbol may retrieve word variants: tu bai ky sang ((ma hoi) or (ma hoa)). hieu qua cac xuc ((va dan) or (va thanh)) co cua tre*.