Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, e literatura
filosofia le » filosofia de, filosofia e, filosofia del
di filosofia » la filosofia, e filosofia
safe studie » safe studio, life studie, safe stupid
case studie » case studies, cases studies, cases studied

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 ((safe studie) OR (case studie)) di filosofia le literatura".
• Adding a wildcard symbol may retrieve word variants: tests ((safe studie) OR (case studie)) di filosofia le literatura*.