Perhaps you should try some spelling variations:
life literature » polite literature, prose literature
safety studien » safety studies, safety study, safety stories
der filosofia » de filosofia, e filosofia, di filosofia
tests safety » test safety, guests safety, stents safety
e literature » e literatur, prose literature, norse literature
studien der » studie der, studenten 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: "tests safety studien der filosofia ((e literature) OR (life literature))*".