Yes, you are right, only by deleting.
(SELECT "region" as type, r.s_name as name, c.s_name as name_top, null as city_id, r.pk_i_id as region_id, r.fk_c_country_code as country_code FROM ' . DB_TABLE_PREFIX . 't_region r, ' . DB_TABLE_PREFIX . 't_country c WHERE r.fk_c_country_code = c.pk_c_code AND r.s_name like "' . $term . '%")
UNION ALL
But so the region disappears from the search