12. The method of claim 11 , comprising: iteratively processing the working set until no documents remain in the working set; and returning, as the discovered keyword query, a disjunction of selected queries; wherein the discovered query returns as results the input collection along with additional related documents from the candidate pool.
14. The method of claim 12 , wherein selecting a document from the working set comprises: generating a vector space model over a collection of snippets; finding a centroid of the working set; and selecting a document in the working set that is closest to said centroid and using the selected document for determining a proximal keyword query for returning a set of documents from the working set.