Perhaps you should try some spelling variations:
2.1 early » 1.1 early
11 early » 1791 early, 7 early, 8 early
13 early » 3 early, 12 early, 14 early
20 early » 10 early, 1820 early, 1720 early
f early » ef early, sf early, 7 early

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: %natural theology %((((((((2.1 early) OR (11 early))) OR (f early))) OR (13 early))) OR (20 early)) works to 1800%22.
• Adding a wildcard symbol may retrieve word variants: %natural theology %((((((((2.1 early) or (11 early))) or (f early))) or (13 early))) or (20 early)) works to 1800%22*.