1. Go to: Data Management > Reports > Reports Classic (tab)
  2. Note the username and password in the center of the screen above the list of reports.
  3. Expand the Site Management report category.
  4. Click "Raw Web Logs"
  5. Enter the username and password you noted above.
Find the files you are looking for and download them.  There is one file per day.

Use software of your choice to open these text files on your local computer and search for the specific data you are looking for.