Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
als studien » aus studien, sals studies, als studium
als student » acs student
y filosofia » e filosofia, a filosofia, di filosofia

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: its ((als studien) OR (als student)) ((y filosofia) OR (la filosofia)) la literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "its ((als studien) OR (als student)) ((y filosofia) or (la filosofia)) la literatura".
• Adding a wildcard symbol may retrieve word variants: its ((als studien) OR (als student)) ((y filosofia) or (la filosofia)) la literatura*.