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
ref history » reef history, bief history, imf history
2023 20th » 2023 26th, 2023 10th, 2020 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 %2.1 germany %((ref history) OR (brief history)) %2023 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian union) or (christian union)) conversations %2.1 germany %((ref history) OR (brief history)) %2023 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian union) or (christian union)) conversations %2.1 germany %((ref history) OR (brief history)) %2023 20th century%22*.