Looks like the "Ctrl+Shift+N" is used twice in the default configuration
"Go to next search result"
"Creates new document before the current one"
Looks like a minor bug to me.
** Update: I just found out that the user can specify his/her own shortcut keys under "Tools -> Keyboard shortcuts". So I fixed this for my system.
[fixed in MI6.35] Keyboard shortcut: Ctrl+Shift+N
Search has new default hotkeys in version 6.35:
Ctrl+Shift+, goes to the previous, and
Ctrl+Shirt+. goes to the next search result
Ctrl+Shift+, goes to the previous, and
Ctrl+Shirt+. goes to the next search result