you have to put dashes instead of the spaces in the user name. or it could mean the screen name is different from the user name. then you won’t be able to see the profile unless you know the user name.
searching? when you click the name, it will enter the correct URL for the user name unless there are spaces in it. or unless it is not the same as the screen name. it can be changed, upon request or by those savvy enough to know how.