• Do NOT type and, or, or not. Use the radio buttons instead.
• If possible, omit common words (a, an, the, of, with, in, etc.).
• Enclose phrases containing and, of, with, etc. in quotation marks.
• Truncate using ? -- diagnos? finds diagnostic, diagnosis, etc.

Examples

• foot mouth disease "match all words"
• "foot and mouth disease" "match exact phrase"
• red cell leukem? "match all words" within "Subject"