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