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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specimen philosophiae slavicae") OR ("spencers philosophie slavicae"))) OR ((("specimens philosophiae slavicae") OR ("specimens philologica slavicae")))).
• Removing quotes may allow a broader search: (((( specimen philosophiae slavicae ) or ( spencers philosophie slavicae ))) or ((( specimens philosophiae slavicae ) or ( specimens philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (((("specimen philosophiae slavicae") or ("spencers philosophie slavicae"))) or ((("specimens philosophiae slavicae") or ("specimens philologica slavicae"))))*.