Perhaps you should try some spelling variations:
studenten die » studenten des, studenten und, studenten fur
studenten der » studenten und
e literatura » de literatura, y literatura, e literatur
tests scale » tests stable, sets scale, tests safe
filosofia e » filosofia de, filosofia del

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 scale ((studenten die) OR (studenten der)) filosofia e literatura".
• Adding a wildcard symbol may retrieve word variants: tests scale ((studenten die) OR (studenten der)) filosofia e literatura*.