WP Job Manager Keywords Search Disregard Order of Terms (untested)

functions.php

<?php

function smyles_custom_posts_search($search, $wp_query) {
    global $wpdb;

    if (empty($search)) {
        return $search; // skip processing - no search term in query
    }

    $q = $wp_query->query_vars;
    $n = !empty($q['exact']) ? '' : '%';

    $search = $searchand = '';

    foreach ((array)$q['search_terms'] as $term) {
        $term = $wpdb->esc_like($term);

        $like = $n . $term . $n;

        $search .= $wpdb->prepare("{$searchand}MATCH($wpdb->posts.post_title, $wpdb->posts.post_content) AGAINST(%s IN BOOLEAN MODE)", $like);

        $searchand = ' AND ';
    }

    if (!empty($search)) {
        $search = " AND ({$search}) ";
        if (!is_user_logged_in()) {
            $search .= " AND ($wpdb->posts.post_password = '') ";
        }
    }

    return $search;
}

add_filter( 'job_manager_get_listings', 'smyles_set_posts_search_filter' );

function smyles_set_posts_search_filter( $args ){
  add_filter('posts_search', 'smyles_custom_posts_search', 500, 2);
  return $args;
}

add_action( 'after_get_job_listings', 'smyles_unset_posts_search_filter' );
function smyles_unset_posts_search_filter(){
  remove_filter('posts_search', 'smyles_custom_posts_search', 500);
}