What I mean by finding it difficult to teach this is that a lot of times it doesn't sink in, or takes a very long time to. Telling people what search terms you used and how you decided what results to click on, and how you distilled what you found in those results into an answer, still does not provide an easy follow path to coming up with search terms for new problems in the future, having good taste in the results to follow, or distilling results into an answer. There is no step by step guide to coming up with search terms, it seems to largely be a function of experience alone.