Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, e literatura
der filosofia » de filosofia, e filosofia, di filosofia
filosofia le » filosofia de, filosofia e, filosofia del
de studio » de estudio, di studio, dvd studio

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: tests ((de studio) OR (un estudio)) der filosofia le literatura.
• Adding a wildcard symbol may retrieve word variants: tests ((de studio) or (un estudio)) der filosofia le literatura*.