Perhaps you should try some spelling variations:
2f early » 24 early, 21 early, 22 early
sf early » ef early, self early, imf early
23 early » 2.3 early, 3 early, 13 early
20 early » 1820 early, 1720 early
10 early » 1800 early, 1820 early, 1770 early
f early » ef early, 7 early, 8 early

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: %natural theology %((((((((2f early) OR (sf early))) OR (f early))) OR (23 early))) OR (((20 early) OR (10 early)))) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%natural theology %((((((((2f early) or (sf early))) or (f early))) or (23 early))) or (((20 early) OR (10 early)))) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %natural theology %((((((((2f early) or (sf early))) or (f early))) or (23 early))) or (((20 early) OR (10 early)))) works to 1800%22*.