Why is this code not working?

When I run this code both columns I get no rows returned. When I do a desc on one of the tables I see both columns. So, why am I not getting any data?

select table_name, column_name
from dba_tab_columns
where
(column_name = 'REGISTRATION_NUMBER' and
column_name = 'DOCUMENT_NUMBER')

Thanks,
Ken Janusz, CPIM
Database Conversion Lead
Sufficient System, Inc.
Minneapolis, MN

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Ken Janusz
  INET: ken.janusz_at_sufsys.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L


(or the name of mailing list you want to be removed from).  You may

also send the HELP command for other information (like subscribing).