Perhaps you should try some spelling variations:
20 martin » v2.0 martin, 20 marine, 20 marian
10 martin » 10 marine, 10 marketing
2 martin » 12 martin, 2 marine
2f 1889 » 23 1889, f 1889, 22 1889
2 1889 » 23 1889, 2 1829, 2 1819
_ 1889 » _ 1880, _ 1819, _ 1849

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 (10 martin))) OR (2 martin)) %((2f 1889) OR (((2 1889) OR (_ 1889))))-1976%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22heidegger%((((20 martin) OR (10 martin))) or (2 martin)) %((2f 1889) or (((2 1889) or (_ 1889))))-1976%22".
• Adding a wildcard symbol may retrieve word variants: %22heidegger%((((20 martin) OR (10 martin))) or (2 martin)) %((2f 1889) or (((2 1889) or (_ 1889))))-1976%22*.