New
#1
You're missing other things that ought to be visible there. Take Cortana to the nearest hospital.
Two basic possibilities:
a. It's fixable by re-registering Cortana (see Tutorials, search for re-register)
b. Your user profile is corrupt - try creating a new user for test purposes. Is Cortana ok there?
And a third- this could be just a symptom of a more general problem.
Well I dont particular see anything els missing just the search results.
At the last restart (probably 5th one since this occurred) a message "app or setting reset" appeared which may or may not be related, and the results suddenly started to display again. :) Hopefully that's the end of it.