JS Function return undefined why?

I need to add +1 to each card clicked but

Function result 3 as undefined why? what is wrong with my code?

card2 and card3 function recive each variable inside each click function

inside function click2 setcard(card2); click3 setcard(card3); and so on

For some reason it do not work.

var card2 = 0;
var card3 = 0;

function setcard(card2, card3) {
  document.getElementById("truecount").innerHTML = card2 + card3;
}

//functions

function clickplus2() {
  resultado += 2;
  zen += 2;
  cartas += 1;
  valor += 2;
  zenok += 11;

  card2 += 1;
  setresultado(resultado, zen, cartas, valor, zenok);
  setcard(card2);
}
function clickplus3() {
  resultado += 3;
  zen += 2;
  cartas += 1;
  valor += 3;
  zenok += 10;

  card3 += 1;
  setresultado(resultado, zen, cartas, valor, zenok);
  setcard(card3);
}