1. A system for grouping similar documents, comprising: a frequency determination module to determine frequencies of occurrences for terms and noun phrases within a set of documents; a threshold module to select a subset of the documents by removing those documents having terms and noun phrases that fall outside a bounded range of upper and lower conditions for frequency of occurrence; a mapping module to map each of the documents in the subset to a cluster of documents based on a similarity of the documents in the subset to the cluster documents; and a processor to execute the modules.