Perhaps you should try some spelling variations:
20 martin » 10 martin, v2.0 martin, 20 marine
2 martin » 12 martin, 2 marine
2f 1889 » 23 1889, 22 1889, 24 1889
f 1889 » _ 1889, 1 1889
2 1889 » 23 1889, 2 1829, _ 1889
_ 1818 » _ 1898, _ 1812, _ 1848

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: %22heidegger%((20 martin) OR (2 martin)) %((((2f 1889) OR (f 1889))) OR (((2 1889) OR (_ 1818))))-1976%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22heidegger%((20 martin) or (2 martin)) %((((2f 1889) OR (f 1889))) or (((2 1889) or (_ 1818))))-1976%22".
• Adding a wildcard symbol may retrieve word variants: %22heidegger%((20 martin) or (2 martin)) %((((2f 1889) OR (f 1889))) or (((2 1889) or (_ 1818))))-1976%22*.