Perhaps you should try some spelling variations:
species studied » species studies, species studying, special studies
spaces studied » space studies, states studied, surfaces studied
die filosofica » di filosofia, de filosofia, e filosofica
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura

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: "tests ((spaces studied) OR (species studied)) die filosofica a literatura".
• Adding a wildcard symbol may retrieve word variants: tests ((spaces studied) OR (species studied)) die filosofica a literatura*.