Busqueda en 3 tablas no relacionadas

[Dude--]

Por cierto una pequeña duda... intenté que no solo devolviera un valor, sino varios y algo debo estar haciendo mal, supongo que es un error de sintaxis:

Código php:

SELECT if( (
SELECT count(*)
FROM nivel1
WHERE Email = '[email protected]'
AND DNI = '28823418z'
) = 0, if( (
SELECT count(*)
FROM nivel2
WHERE Email = '525225'
AND CIF = '252525'
) = 0, if( (
SELECT count(*)
FROM nivel3
WHERE Email = '525252'
AND CIF = '25252'
) <> 0, (
SELECT Pass,Telefono
FROM nivel3
WHERE Email = '525252'
AND CIF = '25252'
), 'los datos introducidos no son correctos' ) ,  (
SELECT Pass,Telefono
FROM nivel2
WHERE Email = '525225'
AND CIF = '252525'
) ) ,  (
SELECT Pass,Telefono
FROM nivel1
WHERE Email = '[email protected]'
AND DNI = '28823418z'
) ) AS password, telefono;