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

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