Perhaps you should try some spelling variations:
"specimens philological slavic" » "specimen histological slavic", "specimen pathological slavic", "species physiological slavic", "specimens philologica slavica", "specimens philologica slavicae", "specimens philologiae slavicae"
"specimina philologiae slavica" » "specimen philosophiae slavica", "specimina philologiae slavicae", "specimina philologica slavica", "specimina philologica slavicae"
"specimina philologica slavic" » "specimina philologica slavica", "specimina philologica slavicae", "specimina philologiae slavicae"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specimina philologica slavic") OR ("specimens philological slavic"))) OR ("specimina philologiae slavica")).
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• Adding a wildcard symbol may retrieve word variants: (((("specimina philologica slavic") or ("specimens philological slavic"))) or ("specimina philologiae slavica"))*.