When searching for individual research studies in healthcare, CINAHL and PubMed should be used. CINAHL is the major database for nursing and allied health literature. PubMed is a way to search MEDLINE, the major database of literature in the biomedical sciences.
Google and Google Scholar are NOT sufficient for doing a good literature search in health care, although you can use Google Scholar to supplement your searches in subject specific databases.
If you use the button and there is no full text, you can request the article for free through interlibrary loan.