Perhaps you should try some spelling variations:
oboen conversations » open conversations, spoken conversations, bot conversations
christian oboen » christian about, christian boehm, christian onof
20th century » 18th century
ref history » reef history, brief history, bief history
imf history » brief history
21 germany » 2.1 germany, 11 germany, 2 germany
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 oboen conversations %21 germany %((ref history) OR (imf history)) %2.2 20th century%22.
• Adding a wildcard symbol may retrieve word variants: %christian oboen conversations %21 germany %((ref history) or (imf history)) %2.2 20th century%22*.