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

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