Use the dropdown at the global search box to select Advanced Search. 

This triggers the option to use connectors. 

Enter your first term, then, select the appropriate connector from the dropdown and enter your next term. 

For phrase searching, use quotation marks. (Ex: "medical record")

Click the plus symbol to add another connector and your next term.

To restrict results by date, select a date range.

You can also select/deselect Libraries from this screen.  

Once all your parameters are set, click the magnifying glass to execute your search.