Perhaps you should try some spelling variations:
21 germany » 2.1 germany, 11 germany, 20 germany
2f history » 2.1 history, imf history, etf history
2 germany » 12 germany, 7 germany, 8 germany
2018 18th » 2018 15th, 2018 14th, 2018 10th
2 german » 3 german, 5 german

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 %((21 germany) OR (((2 germany) OR (2 german)))) %2f history %2018 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((21 germany) or (((2 germany) OR (2 german)))) %2f history %2018 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((21 germany) or (((2 germany) OR (2 german)))) %2f history %2018 18th century%22*.