Perhaps you should try some spelling variations:
"carbon studies in criminology / carbon studies in criminology" » "carbon sources in criminology / carbon sources in criminology", "caribbean studies in criminology / caribbean studies in criminology"
"carbon species in criminology / carbon species in criminology" » "common species in criminology / common species in criminology"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"carbon studies in criminology / carbon studies in criminology\") OR (\"carbon species in criminology / carbon species in criminology\"))".
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• Adding a wildcard symbol may retrieve word variants: (("carbon studies in criminology / carbon studies in criminology") OR ("carbon species in criminology / carbon species in criminology"))*.