It's quite true that there are occasional glitches, and that the index is not updated as regularly as we would all like, but, provided you bear in mind that people sometimes have odd ideas about spelling, it's a pretty good tool. I'd recommend using all lower-case when searching; that may just be superstition, but it seems to work for me; I found the thread on the first attempt.

..."which does exactly what it says on the box" is -more or less- a quote from a tv advert current in the UK at the moment; perhaps I should have left that bit out, as it may confuse.