Perhaps you should try some spelling variations:
del literature » model literature, abel literature, fuel literature
data studium » das studium, data studio, data studied
data studies » dna studies, data studio, area studies
a filosofia » la filosofia, e filosofia, di filosofia
test » text

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((data studium) OR (data studies)) a filosofia del literature".
• Adding a wildcard symbol may retrieve word variants: test ((data studium) OR (data studies)) a filosofia del literature*.