If you're uncertain of a spelling or you want to retrieve records that include variations of a term, use these wildcard symbols: $ or * or ?
In the Boolean Search workspace, su=medic$ and kw=wom$ will result in titles about women and medicine or medical issues.
In the Advanced Search workspace, the example below would be a great way to search for the title "National Geographic" if you couldn't remember whether the real title was National Geographics, National Geographer, National Geography or some other variant.