Perhaps you should try some spelling variations:
22natural theology » natural theology, natural teleology, natural topology
2.1 early » 1.1 early, 11 early
21 early » 11 early, 1.1 early
23 early » 2.3 early, 3 early, 13 early

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: %22natural theology %((((((21 early) OR (2.1 early))) OR (23 early))) OR (1820 early)) works to 1800%22.
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• Adding a wildcard symbol may retrieve word variants: %22natural theology %((((((21 early) OR (2.1 early))) or (23 early))) or (1820 early)) works to 1800%22*.