Perhaps you should try some spelling variations:
9.13 germany » 9.14 germany, 9.15 germany, 9.16 germany
reef history » brief history, reeves history, reef fishery
20th century » 18th century
2.1 germany » 21 germany, 2017 germany, 9.14 germany
2 germany » 7 germany, 2 german, 8 germany
11 german » 1 german
2f 20th » 20 20th, 2.2 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 (((2.1 germany) OR (9.13 germany))))) OR (11 german)) %reef history %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((((2 germany) or (((2.1 germany) OR (9.13 germany))))) or (11 german)) %reef history %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((((2 germany) or (((2.1 germany) OR (9.13 germany))))) or (11 german)) %reef history %2f 20th century%22*.