Perhaps you should try some spelling variations:
"specimina philologica slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimina philologica slavica", "specimina philologie slave"
"specimen philosophiae slavicae" » "specimen philologiae slavicae", "specimen philosophiae publice", "specimen philosophiae suae"
"specimen philologica slavicae" » "specimens philological slavicae", "specimen histological slavicae", "specimen pathological slavicae", "specimen philologica slavica", "specimen philologiae slavicae", "specimen philologie slave"

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 ((("specimen philologica slavicae") OR ("specimina philologica slavicae")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"specimen philosophiae slavicae\") or (((\"specimen philologica slavicae\") OR (\"specimina philologica slavicae\"))))".
• Removing quotes may allow a broader search: (( specimen philosophiae slavicae ) or ((( specimen philologica slavicae ) OR ( specimina philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (("specimen philosophiae slavicae") or ((("specimen philologica slavicae") OR ("specimina philologica slavicae"))))*.