Perhaps you should try some spelling variations:
events safety » agents safety, plants safety
safety studie » safety studies, safety study, safety stories
der filosofia » de filosofia, e filosofia, di filosofia
e literatura » de literatura, e literatur, a literatura
y literatura » la literatura
studie der » studium der

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: "events safety studie der filosofia ((e literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: events safety studie der filosofia ((e literatura) OR (y literatura))*.