To see entries for selected products only, select File -> Preferences -> Help and set the product filter.
To see entries for all installed products, select File -> Preferences -> Help, and clear the Enable product filter check box.
For more or different results, type a different term or reverse the order of the words you type. For example, if you are looking for creating M-files, type M-files and look for the subentry creating.
After selecting an entry, search for specified text in the displayed page using the Find tool, accessible from the Find button on the display pane toolbar.
When there are multiple matching entries, refer to the product associated with each entry, which appears in the second column of the Index results. You might need to make the pane wider to see it.