Perhaps you should try some spelling variations:
da litterature » la litterature, de litterature, a litterature
filosofica da » filosofia da, filosofia de, filosofia di
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 _ filosofica da litterature.
• Adding a wildcard symbol may retrieve word variants: ((test d) or (test de)) studie _ filosofica da litterature*.