1. A method performed by one or more computing devices, the method comprising: comparing current numbers of submissions of keywords in recent search queries to previous numbers of submissions of the keywords in previous search queries submitted during a reference time period; based at least on the current numbers and the previous numbers, designating certain keywords as trending keywords; identifying a trending topic associated with a subset of the recent search queries that include at least some of the trending keywords; identifying selected search results that were returned to the subset of the recent search queries and selected by users; identifying other recent search queries that are also associated with the trending topic but not included in the subset of the recent search queries that include the trending keywords, the other recent search queries being identified by detecting that the other recent search queries also return the selected search results; and creating a dataset for the trending topic that includes the subset of the recent search queries mapped to the selected search results and the other recent search queries mapped to the selected search results.