Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimen pathological slavicae", "specimens philologica slavica", "specimens philologiae slavicae", "specimens philological polemical"
"specimen philologica slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimen pathological slavicae", "specimen philologica slavica", "specimen philologiae slavicae", "specimen 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 philologica slavicae") OR ("specimens philological slavicae"))) OR ("specimen philosophiae publice")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specimen philologica slavicae\") OR (\"specimens philological slavicae\"))) or (\"specimen philosophiae publice\"))".
• Removing quotes may allow a broader search: (((( specimen philologica slavicae ) OR ( specimens philological slavicae ))) or ( specimen philosophiae publice )).
• Adding a wildcard symbol may retrieve word variants: (((("specimen philologica slavicae") OR ("specimens philological slavicae"))) or ("specimen philosophiae publice"))*.