The ITOM wiki-help search capability has been improved a lot, but it seems that you might receive a "No results found" message when you search in a wiki-help if you're using an older version of Chrome.
In case you encounter such issue, either use a different web browser (for example, Internect Explorer) or upgrade your Chrome to a newer version.
In addition, now in wiki-help, you can filter your search result by version, and you can also select multiple products:
