Redwood Self Service Procurement-Search for Items or services Items

1. Open Self Service Procurement - Search for Items or services Items
2. Search : 52233 (Agreement) and Pen
3. Results include 52232 agreement and there is no a PEN in results?
   = Why 52232 agreements are also listen in the results?
   = There is no PEN in 52232 agreement either?
   
   >=? Is there some "wildcard" search for agreement?