Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
va hanh » van hanh, va thanh, va danh
va tinh » may tinh
cac xuc » cam xuc, cac nuoc, chat xuc
cuu tre » cua tre, cau tren, cau treo
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
sai ky » sac ky
ca cuu » cap cuu, cua cuu, ca cua
tu sai » tu bai, tu san, tu cai

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

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