Perhaps you should try some spelling variations:
22christian design » unchristian design, christian designed
20th century » 18th century
ref history » reef history, brief history, bief history
2021 20th » 2021 24th, 2020 20th, 2021 10th
1 german » 2 german, 5 german, 7 german

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 conclusion %((((1 german) OR (3 german))y) OR (((1 german) OR (3 german)))) %ref history %2021 20th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22christian design conclusion %((((1 german) OR (3 german))y) or (((1 german) OR (3 german)))) %ref history %2021 20th century%22".
• Adding a wildcard symbol may retrieve word variants: %22christian design conclusion %((((1 german) OR (3 german))y) or (((1 german) OR (3 german)))) %ref history %2021 20th century%22*.