test-taxquery

$tax_query = array(
	'relation' => 'AND',
	array(
		'taxonomy'         => 'custom_magazine',
		'terms'            => 'entipi-ekdosi',
		'field'            => 'slug',
		'operator'         => 'IN',
	),
	array(
		'taxonomy'         => 'custom_issue',
		'terms'            => 'entipi-ekdosi-28-10-2017',
		'field'            => 'slug',
		'operator'         => 'IN',
	),
);