Tạp Chí CNTT

function tccntt_rand_posts() {
    $args = array(
        'post_type' => 'post',
            'orderby' => 'rand',
                'posts_per_page' => 5,
        );

    $the_query = new WP_Query($args);

    if ($the_query->have_posts() ) {
        $string.= '<ul>';
        while ($the_query->have_posts() ) {
            $the_query->the_post();
            $string.= '<li><a href="'.get_permalink().'">'.get_the_title().'</a></li>';
        }
        $string.= '</ul>';
        /* Restore original Post Data */
        wp_reset_postdata();
    } else {
        $string.= 'no posts found';
    }
    return $string;
} 

<?php echo tccntt_rand_posts(); ?>