1. A method, comprising: receiving, from a user, an identification of a folder including a plurality of documents selected by the user, from a user's corpus; analyzing content of the selected documents; determining a plurality of content groups of documents from a plurality of repositories associated with the user based on text of each document, wherein each content group contains documents having similar content as categorized by the text of each document; determining a target content group, from the plurality of content groups, based on the content of the selected documents, the target content group comprising documents from the plurality of repositories associated with the user; searching the plurality of repositories associated with the user to identify additional content, within the target content group, related to the content of the selected documents; storing the additional content in the folder; locating a relevant document based on the additional content related to the content of the selected documents; presenting the relevant document to the user: and wherein the target content group is selected from a plurality of predetermined sub-content groups that are automatically generated based on clustering of documents of a content group into subgroups that are similar to each other.