Perhaps you should try some spelling variations:
"specimens philosophiae slavicae" » "species philosophy slavicae", "species philosophers slavicae", "specimens philological slavicae", "specimens philosophiae suae", "specimens philosophie islamic", "speciess philosophiae slavicae"
"specimens philosophiae publice" » "species philosophy publice", "species philosophers publice", "specimens philological publice", "specimens philosophy public", "speciess philosophiae publice"
"specimen philosophiae slavicae" » "specimen philosophiae suae", "specimen philosophie islamic", "species philosophiae slavicae"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologie slave", "speciess philologica slavicae"
"specimens philologica sive" » "specimens philological sive", "specimina philologica sive", "specimina philologiae sive", "specimens philologica de", "specimens theologica sive", "specimens philosophicae sive", "speciess philologica sive"
"specimens philologiae slavicae" » "specimens philological slavicae", "specimina philologiae slavicae", "specimina philologica slavicae", "specimens philologica slavica", "specimens philologie slave", "speciess philologiae slavicae"

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