Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "species philosophers slavicae", "specimina philologiae slavicae", "spencers philosophie slavicae", "specimens philologiae slavicae", "specimens philosophiae publice", "specimens philosophiae suae"
"specimens philological suae" » "specimen histological suae", "specimen pathological suae", "specimina philologiae suae", "specimens philological essay", "specimens philological study", "specimens philological fund"
"specimen philosophiae slavicae" » "specimen philologiae slavicae", "specimen philosophiae publice", "specimen philosophiae suae"
"specimina philologica slavicae" » "specimina philologiae slavicae", "specimina philologica slavica", "specimina philologie slave"
"species philosophy classical" » "aspects philosophy classical", "sciences philosophy classical", "speaking philosophy classical"

Try widening your search to All Fields.

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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 philological suae"))) OR ("species philosophy classical"))) OR ("specimina philologica slavicae")))).
• Removing quotes may allow a broader search: (( specimen philosophiae slavicae ) or ((((((( specimens philosophiae slavicae ) or ( specimens philological suae ))) or ( species philosophy classical ))) or ( specimina philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (("specimen philosophiae slavicae") or ((((((("specimens philosophiae slavicae") or ("specimens philological suae"))) or ("species philosophy classical"))) or ("specimina philologica slavicae"))))*.