Perhaps you should try some spelling variations:
"transplantation of organs, tissus" » "transplantation of organs, tissues", "transplantation of organs, tissue", "transplantation of organs, issus"
"transplantation of organs, issue" » "transplantation of organs, issues"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("transplantation of organs, tissus") OR ("transplantation of organs, issue")).
• Removing quotes may allow a broader search: (( transplantation of organs, tissus ) or ( transplantation of organs, issue )).
• Adding a wildcard symbol may retrieve word variants: (("transplantation of organs, tissus") or ("transplantation of organs, issue"))*.