Meta Query

$meta_query = array(
	'relation' => 'OR',
	array(
		'key'     => 'pv_shop_name',
		'value'   => 'burg',
		'compare' => 'LIKE',
	),
	array(
		'key'     => 'pv_shop_slug',
		'value'   => 'burg',
		'compare' => 'LIKE',
	),
	array(
		'key'     => '_wcv_vendor_city',
		'value'   => 'burg',
		'compare' => 'LIKE',
	),
);