Perhaps you should try some spelling variations:
stable studenten » table student, schuler studenten, enable students
la literatura » la litterature, a literature
tests stable » tests table, sets stable, test table
studenten di » studenten die, studenten i, studenten vi
di filosofia » la filosofia, e filosofia

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 literatura) OR (la literatura))*".