Perhaps you should try some spelling variations:
"specimina philologica slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimina philologica slavica", "specimina philologie slave"
"specimen histological slavicae" » "specimens philological slavicae", "special histologic slavicae", "aspects histological slavicae", "specimen histological slices", "specimen histological staging", "specimen philologica slavica"
"specimen pathological slavicae" » "specific pathological slavicae", "specimens philological slavicae", "species pathologic slavicae", "specimen pathological survival", "specimen pathological staging", "specimen pathological state"

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