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

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