function ac_search_mod($query) {
    if(is_search()) {
        $ac_tax_query = array(
            array(
                'taxonomy' => 'ac_state',
                'terms' => $_GET['funeral-state']
                'field' => 'name',
            ),
            array(
                'taxonomy' => 'ac_city',
                'terms' => $_GET['funeral-city'],
                'field' => 'name',
            )
        );

        $query->set('tax_query', $ac_tax_query);
    }
}
add_action('pre_get_posts', 'ac_search_mod');