coleccion
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'coleccion', 'terms' => array( '1', '2' ), 'field' => 'slug', 'operator' => 'IN', ), );
$tax_query = array( 'relation' => 'AND', array( 'taxonomy' => 'coleccion', 'terms' => array( '1', '2' ), 'field' => 'slug', 'operator' => 'IN', ), );