Searching for commands by any part of command name

[Philip Ganchev <phil.ganchev@gmail.com>]

Hi

Emacs command names can be confusing to newcomers and casual users,
partly because of the word order in command names, and partly because
users don't know how to specify the action (which begins the command
name). For example, to close a window, you delete it.  I think it
would be easier if it was possible to search commands
case-insensitively and by text anywhere in the name, rather than only
the beginning. For example, if a user types

M-x window <tab>

then Emacs would list commands including:

balance-windows
buffer-menu-other-window
clone-indirect-buffer-other-window
compare-windows
delete-other-windows
delete-window

Can Emacs be customized or modified to do that?