Perhaps you should try some spelling variations:
15 matthew » _ matthew, 8 matthew
6 matthew » _ matthew, 8 matthew
11 early » 1 early, 1791 early, 5 early
2c 51 » 24 51, 20 51, 21 51
c 51 » c 1, c 5, _ 51

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: %22bible %2f n.t %((15 matthew) OR (6 matthew)) xxviii%((2c 51) OR (c 51)) %2 sermons %((2 early) OR (11 early)) works to 1800%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22bible %2f n.t %((15 matthew) OR (6 matthew)) xxviii%((2c 51) or (c 51)) %2 sermons %((2 early) or (11 early)) works to 1800%22".
• Adding a wildcard symbol may retrieve word variants: %22bible %2f n.t %((15 matthew) OR (6 matthew)) xxviii%((2c 51) or (c 51)) %2 sermons %((2 early) or (11 early)) works to 1800%22*.