Perhaps you should try some spelling variations:
stable studenten » table student, schuler studenten, enable students
tests stable » tests table, sets stable, test table
studenten di » studenten die, studenten i, studenten vi
filosofia de » filosofia del
filosofia y » filosofia e, filosofia _, filosofia da

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "tests stable studenten di ((filosofia y) OR (filosofia de)) literatura*".