Perhaps you should try some spelling variations:
pela literatura » pena literatura, la literatura, a literatura
during studies » docking studies, housing studies, aging studies
tests during » costs during, protests during, testing during
de filosofia » e filosofia, di filosofia, la filosofia
d filosofia » di filosofia, da filosofia, e filosofia

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 during studies ((d filosofia) OR (de filosofia)) pela literatura*".