Perhaps you should try some spelling variations:
corporation biography » corporate biography, reformation biography, federation biography
biography sources » bibliography resources
road corporation » said corporation, railroad corporation, _ corporation
biography series » biography pericles, biography sermons, biography studies
a corporation » _ 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: (( road corporation biography series ) OR ((( a corporation biography series ) OR ( a corporation biography sources )))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( road corporation biography series ) or ((( a corporation biography series ) OR ( a corporation biography sources ))))".
• Adding a wildcard symbol may retrieve word variants: (( road corporation biography series ) or ((( a corporation biography series ) OR ( a corporation biography sources ))))*.