Perhaps you should try some spelling variations:
16th century » 18th century, 19th century, 17th century
2.1 germany » 2017 germany, 9.13 germany, 9.14 germany
imf history » brief history
21 germany » 11 germany, 2 germany, 20 germany

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 %((7 germany) OR (((21 germany) OR (2.1 germany)))) %imf history %2020 16th century%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %((7 germany) or (((21 germany) OR (2.1 germany)))) %imf history %2020 16th century%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %((7 germany) or (((21 germany) OR (2.1 germany)))) %imf history %2020 16th century%22*.