Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "species philosophy slavicae", "specimens philological slavicae", "specimina philologiae slavicae", "specimens philologiae slavicae", "specimens philosophiae suae", "specimens philosophie islamic"
"specimen philosophiae slavicae" » "specimen philologiae slavicae", "specimen philosophiae suae", "specimen philosophie islamic"
"species philosophers slavicae" » "species philosophers france", "species philosophers have", "species philosophers american", "species philosophy slavicae", "sciences philosophers slavicae", "grecian philosophers slavicae"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologiae slavicae", "specimens philologie slave"
"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 ("species philosophers slavicae"))) OR ("specimens philologica slavicae")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specimen philosophiae slavicae\") or (\"specimen philosophiae publice\"))) or (((((\"specimens philosophiae slavicae\") OR (\"species philosophers slavicae\"))) or (\"specimens philologica slavicae\"))))".
• Removing quotes may allow a broader search: (((( specimen philosophiae slavicae ) or ( specimen philosophiae publice ))) or ((((( specimens philosophiae slavicae ) OR ( species philosophers slavicae ))) or ( specimens philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (((("specimen philosophiae slavicae") or ("specimen philosophiae publice"))) or ((((("specimens philosophiae slavicae") OR ("species philosophers slavicae"))) or ("specimens philologica slavicae"))))*.