Is that how it does it, just by associating similar things that have been searched for together? I suppose the question here is whether this happened as a result of synonym matching or as a result of word stemming. I assumed it was stripping off the n and q as suffixes like it'd know to ignore the "ing" if I searched for "running." However, I guess if that were the case, ira nuclear history would turn up the same results, and it doesn't.