Perhaps you should try some spelling variations:
2f germany » 2 germany, 20 germany, 25 germany
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history
20 20th » 90 20th, 2019 20th, 2020 20th
94 14th » 14 14th, 94 11th, 94 19th

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 %((2f germany) OR (21 germany)) %2f history %((20 20th) OR (94 14th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2f germany) OR (21 germany)) %2f history %((20 20th) or (94 14th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2f germany) OR (21 germany)) %2f history %((20 20th) or (94 14th)) century%22*.