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

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