Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "species philosophy slavicae", "species philosophers slavicae", "specimina philologiae slavicae", "specimens philosophiae publice", "specimens philosophiae suae", "specimens philosophie islamic"
"specimens philological slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimina philologiae slavicae", "specimina philological slavicae", "specimina philologiael slavicae", "specimen histologicall slavicae", "specimens philologica slavica", "specimens philological polemical", "specimens philological satirical"
"specimen philosophiae slavicae" » "specimen philosophiae publice", "specimen philosophiae suae", "specimen philosophie islamic"
"speciess philosophiae slavicae" » "speciess philosophiae publice", "speciess philosophiae suae", "speciess philosophie islamic", "species philosophy slavicae", "species philosophers slavicae", "spencers philosophie slavicae"
"specimens philologica slavicae" » "specimina philologica slavicae", "specimina philologiae slavicae", "specimen histological slavicae", "specimens philologica slavica", "specimens philologie slave", "specimens philologica sive"
"specimen pathological slavicae" » "specific pathological slavicae", "species pathologic slavicae", "specimen histological slavicae", "specimen pathological survival", "specimen pathological staging", "specimen pathological state"
"specimens philologiae slavicae" » "specimina philologiae slavicae", "specimina philologica slavicae", "specimens philologica slavica", "specimens philologie slave"

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• Removing quotes may allow a broader search: (( specimen philosophiae slavicae ) or ((((( specimens philosophiae slavicae ) or ( speciess philosophiae slavicae ))) or ((((( specimens philologica slavicae ) or ((( specimens philological slavicae ) OR ( specimen pathological slavicae ))))) or ( specimens philologiae slavicae )))))).
• Adding a wildcard symbol may retrieve word variants: (("specimen philosophiae slavicae") or ((((("specimens philosophiae slavicae") or ("speciess philosophiae slavicae"))) or ((((("specimens philologica slavicae") or ((("specimens philological slavicae") OR ("specimen pathological slavicae"))))) or ("specimens philologiae slavicae"))))))*.