7. One or more computer-readable storage media storing computer-useable instructions that, when used by one or more computing devices, cause the one or more computing devices to perform a method comprising: associating a user with at least one of a plurality of groups based on one or more of a subject matter of past queries submitted by the user or website links previously selected by the user; storing the association of the user with the at least one of the plurality of groups in a first database; receiving user input in a search box that includes at least a portion of a user-submitted query; based on the user-submitted query, accessing a second database to determine one or more suggested alphanumeric strings, wherein the second database contains a plurality of alphanumeric strings that are each associated with at least one category based, in part, on a subject matter of each of the plurality of alphanumeric strings, and wherein the second database further contains one or more structured expressions each comprising a first category and at least a second category related to the first category; communicating for display the one or more suggested alphanumeric strings; receiving from the user a selection of a first alphanumeric string of the one or more suggested alphanumeric strings, the first alphanumeric string associated with a first category; accessing the first database to determine the at least one of the plurality of groups with which the user is associated; identifying a first structured expression in the second database that has a first category matching the first category associated with the first alphanumeric string and a second category that matches the at least one of the plurality of groups with which the user is associated; using the second database, determining at least a second alphanumeric string associated with the second category of the first structured expression communicating for display the first alphanumeric string in association with the at least the second alphanumeric string as a first suggested query.
7. One or more computer-readable storage media storing computer-useable instructions that, when used by one or more computing devices, cause the one or more computing devices to perform a method comprising: associating a user with at least one of a plurality of groups based on one or more of a subject matter of past queries submitted by the user or website links previously selected by the user; storing the association of the user with the at least one of the plurality of groups in a first database; receiving user input in a search box that includes at least a portion of a user-submitted query; based on the user-submitted query, accessing a second database to determine one or more suggested alphanumeric strings, wherein the second database contains a plurality of alphanumeric strings that are each associated with at least one category based, in part, on a subject matter of each of the plurality of alphanumeric strings, and wherein the second database further contains one or more structured expressions each comprising a first category and at least a second category related to the first category; communicating for display the one or more suggested alphanumeric strings; receiving from the user a selection of a first alphanumeric string of the one or more suggested alphanumeric strings, the first alphanumeric string associated with a first category; accessing the first database to determine the at least one of the plurality of groups with which the user is associated; identifying a first structured expression in the second database that has a first category matching the first category associated with the first alphanumeric string and a second category that matches the at least one of the plurality of groups with which the user is associated; using the second database, determining at least a second alphanumeric string associated with the second category of the first structured expression communicating for display the first alphanumeric string in association with the at least the second alphanumeric string as a first suggested query. 15. The one or more computer-readable storage media of claim 7 , further comprising: accessing the second database to identify a second structured expression comprising the first category and at least a third category related to the first category, wherein the third category matches the at least one of the plurality of groups with which the user is associated; determining at least a third alphanumeric string associated with the third category of the second structured expression; and communicating for display the first alphanumeric string in association with the at least the third alphanumeric string as a second suggested query.