There are many ways of expressing your topic, and you should try several of them. Some will work better in some databases than others, depending on whether the content focuses on medicine, law, or philosophy. Always look through your results for ideas on other terms to try.
Possible keywords related to "Medical Assistance in Dying" are:
It's best to use quote around a specific phrase, so it only finds items where those terms are together and have a special meaning.
You can sometimes use an Advanced Search and enter terms in different search boxes, joined with AND.
"physician assisted" or "medical assistance"
AND
dying or death or suicide
AND
"organ donation"
Play with it; it's a creative process, not a prescribed one.
A comprehensive index of philosophy books and articles. Includes real-time indexing of pre-prints, classification by topic, email alerts, reading lists, advanced search functionality, and discussion forums. Largely crowd-sourced and open access.
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The premier index to journal articles in nursing and allied health. For example CINAHL searches, see Finding Article Tips in the Nursing & Health Sciences Subject Guide.
The MEDLINE database through Ovid, searchable along with other Ovid databases. MEDLINE contains a broad range of medical topics relating to research, clinical practice, administration, policy issues, and health care services. Produced by the U.S. National Library of Medicine.
PubMed® comprises more than 36 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full text content from PubMed Central and publisher web sites.