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: %22agriculture AND state %21 germany %((2f history) OR (((bief history) OR (brief history)))) %2f ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %21 germany %((2f history) or (((bief history) OR (brief history)))) %2f ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %21 germany %((2f history) or (((bief history) OR (brief history)))) %2f ((20th century) or (18th century))%22*.