Perhaps you should try some spelling variations:
reef history » reeves history
reef fishery » reef fishes, reef fish
tnf history » etf history, ref history, motif history
2 germany » 12 germany, 7 germany, 2 german

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