Depending on your topic, you may find it helpful to use terms such as those listed below in a variety of combinations (e.g. "medical ethics" and "right to die").
Durable power of attorney
Health services administration
Right to die
Tort liability of hospitals
The Boolean search strategy allows you to combine - or connect - multiple terms into a single search, thereby allowing for a more focused search. The result of a successful Boolean search is a list of results targeted to your specific topic. Knowing how to do a Boolean search is especially helpful when searching large databases for relevant articles. Here is a quick and understandable tutorial if you need more information: