Show by Categories & Tags

$tax_query = array(
	array(
		'taxonomy'         => 'category',
		'terms'            => array( 'art', ' economy' ),
		'field'            => 'slug',
	),
	array(
		'taxonomy'         => 'post_tag',
		'terms'            => array( 'adobe-illustrator', 'adobe-premiere' ),
		'field'            => 'slug',
	),
);