Problem with Portal Search

Hi,

we have installed trex and create an index with some documents from km to test the portal search (KM Search iView) like described here: http://wiki.sdn.sap.com/wiki/display/Search/Creating+Indexes

But now, when I try to search something, there is always displayed the message "No matches"..

Can you please help me further?

Thanks and Regards,

Lydia