Adding quotation marks ("") around phrases tells a database to search for an exact phrase and will make your search more concise. 

Examples: 

"electronic health records"

• Tells the database NOT to search for the word electronic, the word health, and the word records separately.
• Database WILL search for electronic health records when the phrase is in quotations.

"American Nurses Association" 

• Tells the database NOT to search for the word American, the word Nurses, and the word Association separarately.
• Database WILL search for American Nurses Association when the phrase is in quotations.