If you want to combine terms in an advanced search, click the "add row" button in the "Enter Search Term" box. You can add up to four search terms.
Using the drop-down menu in the second search row, you can choose to connect your search terms with "and" or "or." Connecting your terms with "and" will narrow your search to objects containing both terms…
…while using "or" will expand your search to objects containing either term.