Perhaps you should try some spelling variations:
filosofia model » filosofia del, filosofia moderna, filosofia morale
model literatur » modell literatur, model literature, moden literatur
safety studien » safety studies, safety study, safety stories
agents safety » patients safety, plants safety, accidents safety
l filosofia » la filosofia, e filosofia, a filosofia
studien l » studien _, studien 3, studien 4