Perhaps you should try some spelling variations:
bief history » brief hystory, imf history, reef history
2.1 history » 1.1 history, 601 history
21 germany » 11 germany, 2 germany, 20 germany
2f history » imf history, etf history, ref history

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 %21 germany %((((((2f history) OR (2.1 history))) OR (brief history))) OR (bief history)) %2f ((20th century) OR (18th century))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22agriculture and state %21 germany %((((((2f history) OR (2.1 history))) or (brief history))) or (bief history)) %2f ((20th century) or (18th century))%22".
• Adding a wildcard symbol may retrieve word variants: %22agriculture and state %21 germany %((((((2f history) OR (2.1 history))) or (brief history))) or (bief history)) %2f ((20th century) or (18th century))%22*.