Perhaps you should try some spelling variations:
christian agent » christian advent, christian parent, christian parents
bief history » brief history, brief hystory, imf history
20th century » 18th century
ref history » reef history, brief history, imf history
2 german » _ german, 3 german, 5 german
2.2 20th » 2020 20th, 2023 20th, 2021 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: %christian agent conversations %2 german %((ref history) OR (bief history)) %2.2 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian agent conversations %2 german %((ref history) or (bief history)) %2.2 20th century%22*.