Perhaps you should try some spelling variations:
der filosofia » de filosofia, e filosofia, di filosofia
rule studium » duale studium, schule studium, duales studium
de literatur » de literatura, de literatuur, de litterature
e literatur » die literatur
test rule » test rules, tests rule, best rule

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: test rule studium der filosofia ((e literatur) OR (de literatur)).
• Adding a wildcard symbol may retrieve word variants: test rule studium der filosofia ((e literatur) or (de literatur))*.