I regularly have the same problem. It's very frustrating, especially in combination with Google's insistence of doing fuzzy searches instead of the exact query I wanted it to do. I think Google is not so concerned with getting every single result. If their spider skips over a few hundred million pages out of the 130 trillion in the index, it's no big deal for them. And of course it does take some time for the pages to get indexed, though it often happens surprisingly quickly. This is why the Arduino forum should have a real search function. Some time ago it was claimed that this was going to happen but I haven't heard anything since.