Reference sources are an excellent place to start a research project or simply learn more about a particular topic. They provide topic summaries, context, facts, and bibliographies for further reading.
Books are great background sources.
Keyword searches allow you to use your own words as search terms.
Subject heading searches use Library of Congress subject headings.
Here are a couple of suggestions to try.
communication in nursing
community health nursing
intensive care nursing
nursing care plans
nursing law and legislation