I wonder why you can't ask to have your search results returned by date (say, date found by the spider -- whatever) rather than relevance? (To be sure, you can specify the window of dates you want to search . . .)
I wonder why one doesn't see a numeric score for relevance? (Doubtless the answer is because it would provide too much information to SEO manipulators.)
Interestingly, Microsoft's new search offering provides some techniques for weighting the results, which helps.
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