Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimina philologiae slavicae", "specimens philologica slavicae", "specimens philologiae slavicae", "specimens philological polemical"
"specimen pathological slavica" » "specific pathological slavica", "species pathologic slavica", "specimen histological slavica", "specimen pathological survival", "specimen pathological staging", "specimen pathological behavior"
"specimen philologica slavica" » "specimina philologica slavica", "specimen histological slavica", "specimina philologiae slavica"

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