Perhaps you should try some spelling variations:
1918 germany » 8 germany
reef history » reeves history, reef fishery, imf history
20th century » 18th century
2f germany » 2 germany, 20 germany, 21 germany
11 germany » 7 germany, 8 germany, 5 germany
11 german » 1 german
90 20th » 20 20th, 94 20th, 1990 20th

Try widening your search to All Fields.

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 %((2f germany) OR (((((11 germany) OR (11 german))) OR (1918 germany)))) %((reef history) OR (brief history)) %90 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2f germany) or (((((11 germany) or (11 german))) or (1918 germany)))) %((reef history) OR (brief history)) %90 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2f germany) or (((((11 germany) or (11 german))) or (1918 germany)))) %((reef history) OR (brief history)) %90 20th century%22*.