Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimen pathological slavicae", "specimens philologica slavicae", "specimens philologica slavica", "specimens philological satirical"
"specimens philological polemical" » "specimina philologica polemical", "specimen histological polemical", "specimen pathological polemical", "specimens philological philomedical", "specimens philosophical political", "specimens philological critical"
"specimens philologiae slavicae" » "specimina philologiae slavicae", "specimen philosophiae slavicae", "specimina philologica slavicae", "specimens philologica slavicae", "specimens philologica slavica", "specimens philologie slave"

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