[Zope-CMF] selecting catalog items with multiple Subject values?

[Sean Kelley]

I want to list items in the catalog if the Subject is equal to x and y.
 Similar to:
here.portal_catalog.searchResults( Subject='Planning' and 'Technology');
                  
The above gives me all matches to Planning or Technology, not matches to 
subject equal to both values.

How does one do this syntactically?  I tried commas instead of and  
amoung other things