$query->select($db->quoteName(array('code_esp', 'short_name', 'full_name', 'region_name', 'zd_name')));
$query->from($db->quoteName('#__rzd_station_name'));
$query->where($db->quoteName('code_esp') . ' LIKE '. $db->quote('%'.$post.'%'));
SELECT * FROM gal_rzd_station_name WHERE code_esp LIKE '%341%' OR short_name LIKE '%341%'