CATSEARCH - wildcard % does not work for catsearch

Hi,

I am trying to use wildcard % in catsearch, it does not work.
However according to document http://g-solutions.net/icreate-content/main/oracle_wildcard_searching.aspx, wildcard % can be used in catsearch.

**********************************************
SELECT id, price, name
FROM   my_items
WHERE  CATSEARCH(description, '%ouse%', null)> 0;

no rows selected

**********************************************
SELECT id, price, name
FROM   my_items
WHERE  CATSEARCH(description, 'House', null)> 0;

      2860        859
House: 859


        ID      PRICE
---------- ----------
NAME
----------------------------------

      2861        860
House: 860

      2862        861
House: 861

      2863        862
House: 862


        ID      PRICE
---------- ----------
NAME
----------------------------------

      2864        863
House: 863


1000 rows selected.


**********************************************

Am I missing any configuration ? Please guide.

Regards,
Eye Gee