Perhaps you should try some spelling variations:
bief history » brief history, brief hystory, imf history
ref history » reef history, brief history, imf history
2f germany » 2 germany, 20 germany, 21 germany
2019 20th » 2019 4th, 2019 6th, 2019 5th
20 20th » 2020 20th, 2023 20th, 2021 20th
90 20th » 94 20th, 1990 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: %22agriculture AND state %((2f germany) OR (7 germany)) %((ref history) OR (bief history)) %((((20 20th) OR (2019 20th))) OR (90 20th)) century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((2f germany) or (7 germany)) %((ref history) OR (bief history)) %((((20 20th) or (2019 20th))) or (90 20th)) century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((2f germany) or (7 germany)) %((ref history) OR (bief history)) %((((20 20th) or (2019 20th))) or (90 20th)) century%22*.