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", "specimina philological slavicae", "specimina philologiael slavicae", "specimen histologicall slavicae"
"specimens philologiae slavicae" » "specimina philologiae slavicae", "specimen philosophiae slavicae", "specimina philologica slavicae", "specimens philologica slavica", "specimens philologie slave"
"specimens philologica slavicae" » "specimina philologica slavicae", "specimina philologiae slavicae", "specimen histological slavicae", "specimens philologica slavica", "specimens philologie slave", "specimens philologica sive"

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