Perhaps you should try some spelling variations:
1918 germany » 8 germany
reef history » brief history, reeves history, reef fishery
2f germany » 2 germany, 20 germany, 21 germany
11 germany » 11 german, 7 germany, 8 germany
2019 20th » 2019 4th, 2019 6th, 2019 5th
90 20th » 20 20th, 94 20th, 1990 20th

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture AND state %((2f germany) OR (((11 germany) OR (1918 germany)))) %reef history %((2019 20th) OR (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture AND state %((2f germany) OR (((11 germany) OR (1918 germany)))) %reef history %((2019 20th) OR (90 20th)) century%22*.