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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specimen philosophiae slavicae") OR ("specimen philosophiae publice"))) OR ((("specimens philosophiae slavicae") OR ((("specimens philologica slavica") OR ("specimina philologica slavicae")))))).
• Removing quotes may allow a broader search: (((( specimen philosophiae slavicae ) or ( specimen philosophiae publice ))) or ((( specimens philosophiae slavicae ) or ((( specimens philologica slavica ) or ( specimina philologica slavicae )))))).
• Adding a wildcard symbol may retrieve word variants: (((("specimen philosophiae slavicae") or ("specimen philosophiae publice"))) or ((("specimens philosophiae slavicae") or ((("specimens philologica slavica") or ("specimina philologica slavicae"))))))*.