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 philosophie islamic"
"species philosophers slavicae" » "species philosophers france", "species philosophers have", "species philosophers critical", "species philosophy slavicae", "sciences philosophers slavicae", "grecian philosophers slavicae"
"species philosophers american" » "species philosophy american", "species philosophy americana", "species philosophy african", "sciences philosophers american", "grecian philosophers american"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologiae slavicae", "specimens philologie slave"
"specimen philosophiae suae" » "specimen philosophicae sive", "specimen philosophicae quas", "specimen philosophiae essay"

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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 ((("species philosophers slavicae") OR ("species philosophers american"))))) OR ("specimens philologica slavicae")))).
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