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

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