syseng

solved with relevanssi plugin and some codes.

add_action('template_redirect', 'one_match_redirect');
function one_match_redirect() {
    if (is_search()) {
        global $wp_query;
        if ($wp_query->post_count == 1) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
        }
    }
}

add_filter('relevanssi_index_content', 'contentoff');
function contentoff() {
    return false;
}

i’ve solved my question but will not write how to do it. thanks to help me.