Perhaps you should try some spelling variations:
22christian union » christian unity, christian upon
20th century » 18th century
2.1 germany » 21 germany, 2017 germany, 9.13 germany
imf history » brief history
2f history » etf history, ref history, tnf history
2 germany » 12 germany, 7 germany, 2 german
2f 20th » 20 20th, 2.2 20th

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: %((22christian union) OR (christian union)) conversations %((2 germany) OR (2.1 germany)) %((2f history) OR (imf history)) %2f 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian union) OR (christian union)) conversations %((2 germany) or (2.1 germany)) %((2f history) or (imf history)) %2f 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian union) OR (christian union)) conversations %((2 germany) or (2.1 germany)) %((2f history) or (imf history)) %2f 20th century%22*.