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 philosophie islamic", "speciess philosophiae slavicae"
"speciess philosophiae slavicae" » "speciess philologiae slavicae", "speciess philosophiae publice", "speciess philosophie islamic", "species philosophy slavicae", "species philosophers slavicae", "spencers philosophie 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"
"specimen philosophiae suae" » "specimen philosophicae sive", "specimen philosophicae quas", "specimen philosophiae essay", "species philosophiae suae"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("specimen philosophiae suae") OR ((((("specimens philosophiae slavicae") OR ("speciess philosophiae slavicae"))) OR ("specimens philologica slavicae")))).
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