Perhaps you should try some spelling variations:
"specimen histological slavicae" » "specimens philological slavicae", "specimen pathological slavicae", "special histologic slavicae", "specimen histological slices", "specimen philologica slavicae", "specimen histological staging"
"specimen philosophiae slavicae" » "specimen philosophiae publice", "specimen philologica slavicae", "specimen philosophiae suae"
"specimen philologiae slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimina philologica slavicae", "specimen philologica slavicae", "specimen philologica slavica", "specimen philologie slave"

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