look at this example structure :
/**
* Section Servises
*/
$servises_info = new WP_query('pagename=правни-услуги');
if ($servises_info -> have_posts() ) :
while ( $servises_info -> have_posts() ) : $servises_info -> the_post();
// look hire below
$relayted_post = new WP_query('cat=2&order=ASC');
/* Start the Loop two */
while($relayted_post -> have_posts()): $relayted_post -> the_post();
$servises_data = get_the_content();
// make hire you're things
endwhile;
// End the posts Servises Loop - loop 2
endwhile;
// End the page Servises Loop -loop 1
endif;
wp_reset_postdata();
// End the servises info section
i recomend to use ID’s no names when accses categorys,taxonomis.
And also you have mistakes hire :
<h2 class="text-white"><?php the_title() mising closing row -> ";" ?></h2>
<div class="text-white"><?php the_content() mising closing row -> ";" ?></div>