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

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