I would speculate that DDG caches its results and then fuzzy-matches them with other search queries (maybe fuzzier and fuzzier based on load). So if you enter a

I would speculate that DDG caches its results and then fuzzy-matches them with other search queries (maybe fuzzier and fuzzier based on load). So if you enter a similar query, you may get a previously-cached list of hits, which may or may not be as relevant as if your query was actually run. This is just speculation though