Perhaps you should try some spelling variations:
"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", "access philosophie slavicae"
"species philosophers slavicae" » "species philosophers france", "species philosophers have", "species philosophers american", "species philosophy slavicae", "sciences philosophers slavicae", "grecian philosophers slavicae"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologie slave", "specimens philologica sive"
"specimen philologiae slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimina philologica slavicae", "specimen philologica slavica", "specimen philologie slave"
"spencers philosophie slavicae" » "sciences philosophie slavicae", "spencer philosophy slavicae", "schelers philosophie slavicae", "spencers philosophie islamic", "spencers philosophie asiatique", "spencers philosophie avec"

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