Perhaps you should try some spelling variations:
22great britain » great britain, xgreat britain, zgreat britain
reef history » brief history, reeves history, reef fishery
ref history » brief history, bief history, imf history
2f george » 26 george, 22 george, 29 george
2f early » 24 early, 20 early, 22 early
11 early » 1 early, 1791 early, 7 early
2 george » 12 george, 26 george, 2 georges
21 early » 2.1 early, 1 early, 1.1 early
2c 1727 » 29 1727, 28 1727, 22 1727

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: %22great britain %((ref history) OR (reef history)) %((2f george) OR (2 george)) iii%2c 1727-1760 %((2f early) OR (((21 early) OR (11 early)))) works to 1800%22*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22great britain %((ref history) or (reef history)) %((2f george) OR (2 george)) iii%2c 1727-1760 %((2f early) or (((21 early) or (11 early)))) works to 1800%22*".