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

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