Perhaps you should try some spelling variations:
9.13 germany » 9.14 germany, 9.15 germany, 9.16 germany
20th century » 18th century
21 germany » 2 germany, 20 germany, 7 germany
11 germany » 11 german, 1918 germany, 7 germany
8 germany » 7 germany, 1918 germany
2020 20th » 2020 16th, 2020 2021, 2020 5th

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 %((8 germany) OR (((((21 germany) OR (11 germany))) OR (9.13 germany)))) %brief history %2020 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((8 germany) or (((((21 germany) OR (11 germany))) or (9.13 germany)))) %brief history %2020 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((8 germany) or (((((21 germany) OR (11 germany))) or (9.13 germany)))) %brief history %2020 20th century%22*.