Perhaps you should try some spelling variations:
ref history » reef history, brief history, bief history
21 public » 2 public, 1 public, 3 public
11 public » 1 public, 2 public, 3 public
22 public » 2 public, 12 public, 3 public
23 green » 3 green, 13 green
2f 1688 » 2 1688, 24 1688, 28 1688
22 1688 » 2 1688

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: %22finance%((((21 public) OR (11 public))) OR (22 public)) %((23 green) OR (3 great)) britain %ref history %((2f 1688) OR (22 1688))-1815%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22finance%((((21 public) OR (11 public))) or (22 public)) %((23 green) or (3 great)) britain %ref history %((2f 1688) or (22 1688))-1815%22".
• Adding a wildcard symbol may retrieve word variants: %22finance%((((21 public) OR (11 public))) or (22 public)) %((23 green) or (3 great)) britain %ref history %((2f 1688) or (22 1688))-1815%22*.