Perhaps you should try some spelling variations:
la literatura » la litterature
d filosofia » di filosofia, de filosofia, da filosofia
studium d » studium ad, studium _, studium 1
test dem » test der, test de, nebst dem
test des » test der, test test

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 dem) OR (test des)) studium d filosofia ((la literatura) OR (a literature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test dem) OR (test des)) studium d filosofia ((la literatura) or (a literature))".
• Adding a wildcard symbol may retrieve word variants: ((test dem) OR (test des)) studium d filosofia ((la literatura) or (a literature))*.