Bài viết liên quan cho custom taxonomy trên wordpress

<!-- begin custom related loop, isa -->

<?php 

// get the custom post type's taxonomy terms

$custom_taxterms = wp_get_object_terms( $post->ID, 'project_category', array('fields' => 'ids') );

// arguments

$args = array(

'post_type' => 'project',

'post_status' => 'publish',

'posts_per_page' => 3, // you may edit this number

'orderby' => 'rand',

'tax_query' => array(

    array(

        'taxonomy' => 'project_category',

        'field' => 'id',

        'terms' => $custom_taxterms

)

),

'post__not_in' => array ($post->ID),

);

$related_items = new WP_Query( $args );

// loop over query

if ($related_items->have_posts()) :

echo '<ul>';

while ( $related_items->have_posts() ) : $related_items->the_post();

?>

    <li><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></li>

<?php

endwhile;

echo '</ul>';

endif;

// Reset Post Data

wp_reset_postdata();

?>

<!-- end custom related loop, isa -->

Link: https://isabelcastillo.com/related-custom-post-type-taxonomy