1. A computer-implemented method for providing information based on automatically determined relationships, the method comprising: under control of one or more computing systems configured to provide recommendation information based on automatically determined relationships between terms, receiving one or more indications of a group of multiple content items whose contents are representative of a subject area of interest, the contents including a plurality of terms; automatically analyzing the multiple content items of the group to identify relationships between at least some of the plurality of terms, a first of the identified relationships indicating an assessed degree of relevance of one or more first terms of the plurality of terms to one or more other second terms of the plurality of terms; obtaining information about one or more indicated terms that are specified by a first user as search terms for a search to be performed, the indicated terms including at least one of the first terms but not including any of the second terms; for each of one or more of the second terms, automatically determining a likelihood that the second term is of interest to the first user based at least in part on the at least one first term included in the indicated terms and on the assessed degree of relevance of the one or more first terms to the one or more second terms; generating search results for the search, including identifying one or more search results using at least one second term of the one or more second terms that is selected based on one or more determined criteria for assessing the determined likelihoods; and providing the generated search results for display to the first user.