In my personal opinion, Search function on help.sap.com is a powerful, but not really a quick option. What I found is working better for me, is using ... google.com to search results on help.sap.com. To do this you need to limit searched servers in google.com with "site:http://help.sap.com/saphelp_nw04 " or "site:http://help.sap.com/saphelp_nw04s " and then key words you are looking for. As on the screenshot below: I am using Google to do my search, but I believe same approach (limit results to one site only) is available in all wide-used search engines.