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

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