Post Querry

// WP_Query arguments
$args = array(
	'post_type'              => array( 'post_solutions' ),
	'has_password'           => false,
	'nopaging'               => true,
	'tax_query'              => array(
		'relation' => 'OR',
		array(
			'taxonomy'         => 'tax_technology',
			'field'            => 'slug',
			'include_children' => true,
		),
	),
);

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

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

// Restore original Post Data
wp_reset_postdata();