Perhaps you should try some spelling variations:
1918 germany » 8 germany
reef history » brief history, reeves history, reef fishery
20th century » 18th century
11 germany » 7 germany, 8 germany, 5 germany
2 germany » 12 germany, 7 germany, 2 german
11 german » 1 german
20 20th » 90 20th, 2019 20th, 2020 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 %((2 germany) OR (((((11 germany) OR (11 german))) OR (1918 germany)))) %reef history %20 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) or (((((11 germany) or (11 german))) or (1918 germany)))) %reef history %20 20th century%22*.