Perhaps you should try some spelling variations:
safety studien » safety studies, safety study, safety stories
sdi literature » sci literature, sufi literature, i literature
filosofia sdi » filosofia di, filosofia de, filosofia da
test safety » tests safety, best safety, rest safety
4 filosofia » e filosofia, a filosofia, y filosofia
studien 4 » studien _, studien 3, studien 5