Perhaps you should try some spelling variations:
"specialist periodical reports" » "specialized periodicals reports", "socialism periodicals reports", "specialist neurological reports", "specialist periodical returns", "specialist periodic report", "specialist periodical record"
specialist medical » special medical, specific medical
specialist seminar » special seminar, specialist settings

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("specialist periodical reports") OR ("((specialist medical) OR (specialist seminar)) reports")).
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