Perhaps you should try some spelling variations:
22christian design » unchristian design
christian designed » christianity designed, christ designed, christian divine
reef history » brief history, reeves history, reef fishery
2.1 germany » 21 germany, 2017 germany, 9.13 germany
ref history » brief history, bief history, imf history
2f 20th » 2.2 20th
20 20th » 90 20th, 2019 20th, 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 design) OR (christian designed)) conversations %2.1 germany %((reef history) OR (ref history)) %((2f 20th) OR (20 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%((22christian design) or (christian designed)) conversations %2.1 germany %((reef history) or (ref history)) %((2f 20th) OR (20 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %((22christian design) or (christian designed)) conversations %2.1 germany %((reef history) or (ref history)) %((2f 20th) OR (20 20th)) century%22*.