Perhaps you should try some spelling variations:
20th century » 18th century
12 germany » 11 germany, 12 german, 14 germany
8 germany » 7 germany, 1918 germany
2 germany » 7 germany, 2 german, 5 germany
2f 20th » 20 20th, 2.2 20th

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 (((2 germany) OR (12 germany)))) %brief history %2f 20th century%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((8 germany) or (((2 germany) OR (12 germany)))) %brief history %2f 20th century%22*".