Tips for using this feature:

• Enclose multiple-word terms in quotes (example: "heart failure")
• Use a plus sign (+) to include information (example: +asthma +treatment)
• Use a minus sign (-) to exclude information (example: asthma -treatment)
• Make sure the word or term is spelled correctly
• Use the correct case (for example, searching on "heart failure" will find all uses of the term, while searching on "Heart Failure" will find only those instances where the words begin with a capital letter)
• Try synonyms and variations of words (example: health care and healthcare).