8. A system comprising: one or more processors; a memory; a re-weighting module configured to perform acts, the acts comprising: identifying topic phrases associated with documents; determining a latent topic by associating the documents with weight factors based on an association of terms within constituent phrases that appear in the documents, at least one concept being characterized by the latent topic; and re-weighting the documents, the re-weighting comprising strengthening a subset of the documents that are indicated by the latent topic by adjusting document weights to increase a term frequency of one or more terms within the subset of the documents associated with the latent topic; a diversification module configured to perform acts comprising: evaluating, based in part on the increase of the term frequency of the one or more terms, a modified latent semantic analysis (LSA)-weighted frequency of one or more documents of the subset of the documents; removing documents associated with one or more similar concepts to result in a list of documents with unlike concepts.
8. A system comprising: one or more processors; a memory; a re-weighting module configured to perform acts, the acts comprising: identifying topic phrases associated with documents; determining a latent topic by associating the documents with weight factors based on an association of terms within constituent phrases that appear in the documents, at least one concept being characterized by the latent topic; and re-weighting the documents, the re-weighting comprising strengthening a subset of the documents that are indicated by the latent topic by adjusting document weights to increase a term frequency of one or more terms within the subset of the documents associated with the latent topic; a diversification module configured to perform acts comprising: evaluating, based in part on the increase of the term frequency of the one or more terms, a modified latent semantic analysis (LSA)-weighted frequency of one or more documents of the subset of the documents; removing documents associated with one or more similar concepts to result in a list of documents with unlike concepts. 9. The system of claim 8 , wherein the re-weighting module performs acts further comprising: arranging the latent topic among other determined latent topics based on a singular value of the latent topic; and extracting at least one topic phrase from the latent topic based in part on the evaluating the modified LSA-weighted frequency.