Search function in help window

Sometimes, when I have to use the manual to bring me certain things back to mind quickly, and I can't find them at once, by browsing thru the index of the desks user-manual, I then have to fllp out my phone and load the user-manual pdf file for searching certain terms.
It would be a big help if the desks manual had a search function, too, to shorten that process or when there is no phone oder internet available at the moment.