Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "species philosophy slavicae", "specimens philological slavicae", "specimina philologiae slavicae", "specimens philologiae slavicae", "specimens philosophiae publice", "specimens philosophiae suae"
"specimen philosophiae slavicae" » "specimen philologiae slavicae", "specimen philosophiae publice", "specimen philosophiae suae"
"species philosophers slavicae" » "species philosophers france", "species philosophers have", "species philosophers american", "species philosophy slavicae", "sciences philosophers slavicae", "grecian philosophers slavicae"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologiae slavicae", "specimens philologie slave"

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• Adding a wildcard symbol may retrieve word variants: (("specimen philosophiae slavicae") or ((((("specimens philosophiae slavicae") OR ("species philosophers slavicae"))) or ("specimens philologica slavicae"))))*.