12. A system comprising: one or more server devices to: receive, from a client, a search query, receive, from the client, information identifying a document, the document being associated with context information, obtain search results based on the search query, the search results identifying documents relevant to the search query, analyze the context information to identify content, generate a plurality of first scores for a hierarchy of topics, each first score, of the plurality of first scores, corresponding to a respective measure of relevance of each topic, of the hierarchy of topics, to the content, select a topic, of the hierarchy of topics, as being most relevant to the context information when the topic is associated with a greatest first score of the plurality of first scores, generate a plurality of second scores for the search results, each second score, of the plurality of second scores, corresponding to a respective measure of relevance, of each of the search results, to the topic, select one or more of the search results, as a selected one or more search results, as being most relevant to the topic when the one or more of the search results are associated with one or more greatest second scores, of the plurality of second scores, generate a search result document that includes the selected one or more search results, and provide, for presentation, the generated search result document, including the selected one or more search results, to the client.
16. The system of claim 12 , where, when classifying the context information, the one or more server devices are further to: determine whether the greatest first score is greater than a threshold, and send, to the client, a search result document, that includes the search results based on the search query, when the greatest first score is not greater than the threshold, where the one or more server devices, when providing for presentation the generated search result document, are further to: provide, for presentation, the generated search result document, that includes the selected one or more search results, when the greatest first score is greater than the threshold.