Perhaps you should try some spelling variations:
reef history » brief history, reeves history, reef fishery
25 germany » 5 germany, 21 germany, 26 germany
20 germany » 7 germany, 8 germany, 5 germany
2 germany » 7 germany, 2 german, 8 germany
2019 20th » 2019 4th, 2019 6th, 2019 5th
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 %((((25 germany) OR (2 germany))) OR (20 germany)) %reef history %((2019 20th) OR (94 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((25 germany) OR (2 germany))) or (20 germany)) %reef history %((2019 20th) or (94 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((25 germany) OR (2 germany))) or (20 germany)) %reef history %((2019 20th) or (94 20th)) century%22*.