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

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