Perhaps you should try some spelling variations:
21 bishop » 128 bishop, _ bishop, a bishop
11 bishop » 1715 bishop, 1761 bishop, 128 bishop
2f saint » 2 saint, _ saint, a saint
21 saint » 1 saint, 2 saint, 2013 saint
25 saint » 5 saint, 15 saint, 2015 saint
2f d » f d, 23 d, 24 d
21 d » 21 _, 1 d, 21 a

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: %22ignatius %((2f saint) OR (((21 saint) OR (25 saint))))%((r.c bishop) OR (((21 bishop) OR (11 bishop)))) of antioch %((((2f d) OR (21 d))) OR (2 d)). ca. 110%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22ignatius %((2f saint) or (((21 saint) or (25 saint))))%((r.c bishop) or (((21 bishop) or (11 bishop)))) of antioch %((((2f d) OR (21 d))) or (2 d)). ca. 110%22".
• Adding a wildcard symbol may retrieve word variants: %22ignatius %((2f saint) or (((21 saint) or (25 saint))))%((r.c bishop) or (((21 bishop) or (11 bishop)))) of antioch %((((2f d) OR (21 d))) or (2 d)). ca. 110%22*.