Perhaps you should try some spelling variations:
doubles studium » duales studium
del literatura » de literatura, pela literatura, da literatura
de filosofia » e filosofia, di filosofia, la filosofia
studium de » studium der, studium des, studium die

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 OR text) doubles studium de filosofia del literatura.
• Adding a wildcard symbol may retrieve word variants: (test or text) doubles studium de filosofia del literatura*.