Perhaps you should try some spelling variations:
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
2018 18th » 2018 15th, 2018 14th, 2018 10th

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 %((2.1 germany) OR (21 germany)) %2f history %2018 18th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2.1 germany) OR (21 germany)) %2f history %2018 18th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2.1 germany) OR (21 germany)) %2f history %2018 18th century%22*.