Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, e literatura
da literatura » la literatura, a literatura, de literatura
test dose » test de, test die, test do
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 des) OR (test dose)) studie _ filosofia ((del literatura) OR (da literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test des) or (test dose)) studie _ filosofia ((del literatura) OR (da literatura))".
• Adding a wildcard symbol may retrieve word variants: ((test des) or (test dose)) studie _ filosofia ((del literatura) OR (da literatura))*.