Perhaps you should try some spelling variations:
1918 germany » 8 germany
reef history » brief history, reeves history, reef fishery
20th century » 18th century
2f germany » 2 germany, 20 germany, 21 germany
94 20th » 4 20th, 90 20th, 94 24th

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 (1918 germany)) %reef history %94 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2f germany) or (1918 germany)) %reef history %94 20th century%22*.