Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimen histological slavicae", "specimen pathological slavicae", "species physiological slavicae", "specimens philologica slavicae", "specimens philological polemical", "specimens philological satirical", "specimens philological slavice"
"specimens philologiae slavicae" » "specimen philosophiae slavicae", "specimens philologica slavicae", "specimens philologie slave", "specimens philologiae slavice"
"specimina philologiae slavicae" » "specimen philosophiae slavicae", "specimina philologica slavicae", "specimina philologie slave", "specimina philologiae slavice"
"specimina philologica slavica" » "specimina philologica slavic"

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