Perhaps you should try some spelling variations:
safety studie » safety studies, safety study, safety stories
tests safety » test safety, guests safety, stents safety
filosofia da » filosofia de, filosofia del, filosofia e
da literatur » da literatura, dna literatur, dsa literatur
a filosofia » la filosofia, e filosofia, di filosofia
studie a » studie am, studie 2, studie _