No Help!

When you enter a search term within Revit,    
your internet browser is launched to display Autodesk WikiHelp.
It may return no results:-

No worries. Just type your search in the webpage instead and you should get some results.  To save time, don’t bother typing it in Revit.  Just click on the binoculars icon instead.

Edit: If you experience this problem then contact your IT department.  It may be due to proxy restrictions stopping the search term from being passed to the web page.