Perhaps you should try some spelling variations:
20 martin » 10 martin, v2.0 martin, 20 marine
2 martin » 12 martin, 2 marine
2f 1889 » 2 1889, f 1889, 22 1889
23 1889 » 1823 1889
2 1829 » _ 1829
_ 1849 » _ 1844, _ 1848, _ 1847

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 (23 1889))) OR (((2 1829) OR (_ 1849))))-1976%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22heidegger%((20 martin) or (2 martin)) %((((2f 1889) OR (23 1889))) or (((2 1829) or (_ 1849))))-1976%22".
• Adding a wildcard symbol may retrieve word variants: %22heidegger%((20 martin) or (2 martin)) %((((2f 1889) OR (23 1889))) or (((2 1829) or (_ 1849))))-1976%22*.