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

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specimen histological slavicae") OR ("specimen pathological slavicae"))) OR ("specimen philosophiae slavicae")).
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