Perhaps you should try some spelling variations:
corporation biography » corporate biography, reformation biography, federation biography
biography pericles » biography problems, biography periodicals
biography series » biography sources, biography sermons, biography studies
_ corporation » _ corporate
a corporation » a corporate

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((( _ corporation biography series ) OR ( _ corporation biography pericles ))) OR ( a corporation biography series )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( _ corporation biography series ) OR ( _ corporation biography pericles ))) or ( a corporation biography series ))".
• Adding a wildcard symbol may retrieve word variants: (((( _ corporation biography series ) OR ( _ corporation biography pericles ))) or ( a corporation biography series ))*.