MATKONIM-SEARCH

// WP_Query arguments
$args = array(
	'post_type'              => array( 'matkonim' ),
	's'                      => 'mykeyword',
	'tax_query'              => array(
		'relation' => 'AND',
		array(
			'taxonomy'         => 'entity',
			'terms'            => array( '15', '12' ),
			'field'            => 'term_id',
		),
	),
);

// The Query
$query = new WP_Query( $args );

// The Loop
if ( $query->have_posts() ) {
	while ( $query->have_posts() ) {
		$query->the_post();
		// do something
	}
} else {
	// no posts found
}

// Restore original Post Data
wp_reset_postdata();