Perhaps you should try some spelling variations:
"specimen philosophiae slavicae" » "specimen philologiae slavicae"
"specimens philosophie islamic" » "species philosophy islamic", "spencers philosophie islamic", "sciences philosophie islamic", "specimens philosophy islamic", "specimens philosophie analytic", "specimens philosophie bismarck"
"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"
"specimen philosophiae suae" » "specimen philosophicae sive", "specimen philosophicae quas", "specimen philosophiae essay"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("specimen philosophiae slavicae") OR ("specimen philosophiae suae"))) OR ("specimen philosophiae publice"))) OR ((("specimens philosophie islamic") OR ("specimens philologica slavicae")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"specimen philosophiae slavicae\") OR (\"specimen philosophiae suae\"))) or (\"specimen philosophiae publice\"))) or (((\"specimens philosophie islamic\") or (\"specimens philologica slavicae\"))))".
• Removing quotes may allow a broader search: (((((( specimen philosophiae slavicae ) OR ( specimen philosophiae suae ))) or ( specimen philosophiae publice ))) or ((( specimens philosophie islamic ) or ( specimens philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (((((("specimen philosophiae slavicae") OR ("specimen philosophiae suae"))) or ("specimen philosophiae publice"))) or ((("specimens philosophie islamic") or ("specimens philologica slavicae"))))*.