13. A computer-readable memory device storing programming instructions that are executable by one or more processors of one or more devices, the programming instructions comprising: one or more instructions to analyze trends relating to at least one of search queries or search results that are responsive to search queries, to a particular set of search terms relating to one or more particular topics; one or more instructions to identify, in response to a search query: a first document that is associated with the particular set of search terms that relate to the one or more particular topics, and a second document that is not associated with the particular set of search terms that relate to the one or more particular topics; one or more instructions to generate a first score for the first document and a second score for the second document; and one or more instructions to rank the first document with regard to the second document based on the first score and the second score.
13. A computer-readable memory device storing programming instructions that are executable by one or more processors of one or more devices, the programming instructions comprising: one or more instructions to analyze trends relating to at least one of search queries or search results that are responsive to search queries, to a particular set of search terms relating to one or more particular topics; one or more instructions to identify, in response to a search query: a first document that is associated with the particular set of search terms that relate to the one or more particular topics, and a second document that is not associated with the particular set of search terms that relate to the one or more particular topics; one or more instructions to generate a first score for the first document and a second score for the second document; and one or more instructions to rank the first document with regard to the second document based on the first score and the second score. 15. The computer-readable memory device of claim 13 , where the one or more instructions to determine the particular set of search terms relating to the one or more particular topics include: one or more instructions to determine an increase in a number of search results generated in response to search queries with the same or similar groups of search terms, and one or more instructions to identify the same or similar groups of search terms as the particular set of search terms relating to the one or more particular topics.