Perhaps you should try some spelling variations:
22christian design » unchristian design, christian designed
design conclusions » design conclusion
ref history » reef history, brief history, bief history
21 germany » 2.1 germany, 11 germany, 2 germany
2021 20th » 2021 24th, 2020 20th, 2023 20th
2021 10th » 2022 10th, 2021 13th, 2021 16th

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 conclusions %((21 germany) OR (7 germany)) %ref history %((2021 20th) OR (2021 10th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian design conclusions %((21 germany) or (7 germany)) %ref history %((2021 20th) OR (2021 10th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian design conclusions %((21 germany) or (7 germany)) %ref history %((2021 20th) OR (2021 10th)) century%22*.