Perhaps you should try some spelling variations:
reef history » brief history, reeves history, reef fishery
20th century » 18th century
2 germany » 12 germany, 7 germany, 2 german
8 germany » 7 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th

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 (((8 germany) OR (1918 germany)))) %reef history %2020 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2 germany) or (((8 germany) or (1918 germany)))) %reef history %2020 20th century%22*.