Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, de litteratura
e literatura » de literatura, y literatura, e literatur
test de » test der, test des, est de
test d » test do, test der, test des

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 d) OR (test de)) studie _ filosofia ((le literatura) OR (e literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((test d) or (test de)) studie _ filosofia ((le literatura) OR (e literatura))".
• Adding a wildcard symbol may retrieve word variants: ((test d) or (test de)) studie _ filosofia ((le literatura) OR (e literatura))*.