it is said
Me suena a chino
(It sounds like Chinese to me)
Estas instrucciones me suenan a chino (Those instructions are all Greek to me).
Intentó explicarme las reglas del juego, pero me sonaba a chino (He tried to explain the rules of the game to me, but it was all Greek to me).
Remember that nationalities in Spanish are not written with capital letters and they have to agree in gender and number with the thing or person they are referred to. Why don’t you learn a little more about nationalities?