Service Tax

$tax_query = array(
	'relation' => 'AND',
	array(
		'taxonomy'         => 'service_group',
		'terms'            => array( '18', '20' ),
		'field'            => 'term_id',
	),
	array(
		'taxonomy'         => 'service_sector',
		'terms'            => array( '25', '50' ),
		'field'            => 'term_id',
	),
);