mujahidi

<?php

add_filter( 'posts_search', 'm_cars_search_vin' );

function m_cars_search_vin( $where ) {
    global $pagenow, $wpdb, $wp;

    // check if we are on the right page & performing a search & for the right post type
    if ( 'edit.php' != $pagenow || ! is_search() || ! isset( $wp->query_vars['s'] ) || 'cars' != $wp->query_vars['post_type'] ) {
        return $where;