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I was looking for the answer to a question whose title I forgot. Since I knew who gave it (Allen Hatcher), what could have been easier: just go to his user page and it's linked from there, right? Wrong! Typing either his first or last name in user tab search didn't yield anything. Similarly, I couldn't find him in the list of users sorted by the reputation. For a few minutes I thought that he quit MO for some reason and deleted his account, which was a very disconcerting thought. Fortunately, a search of another question that I remembered him answering led me to his user page. So with some effort that involved memory search (more efficient than the questions search!), I got what I needed. However, I am mystified as to why the user name search didn't work. Is this a bug or an undocumented feature of the system? I recall other instances of likewise not being able to find a user whom I had seen previously.
If a user is unregistered, you must search for the exact name to find him or her in the user list.
Thank you, Harry, that explains it.
Jonas, google search isn't any different from the internal search function. In this case, plentiful references to Hatcher's Algebraic topology come up, not his answers or user page.
For me, to get the google search to be different from internal search, I have to add "http://":
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