Perhaps you should try some spelling variations:
biography sermons » biographical sermons
biography germany » photography germany, biography great
rand corporation » said corporation, road corporation, a corporation
biography series » biography pericles, biography sources, biography studies

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: rand corporation ((biography series) OR (((biography sermons) OR (biography germany)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "rand corporation ((biography series) or (((biography sermons) OR (biography germany))))".
• Adding a wildcard symbol may retrieve word variants: rand corporation ((biography series) or (((biography sermons) OR (biography germany))))*.