18. A system for suggesting keywords for a litigation hold, comprising: a first receiver, implemented on a computing device including at least one processor, configured to receive a seed set of keywords; an identifier, implemented on the computing device, configured to identify a set of documents corresponding to the seed set of keywords; a generator, implemented on the computing device, configured to: determine an indication of relevance for each document in a subset of the set of documents, wherein the subset comprises a plurality of documents, wherein the indication of relevance for each document comprises a specified percentage degree of relevance of the document to the seed set of keywords, compute a discriminatory power of the keywords based on the indication of relevance for each document, wherein the discriminatory power of each keyword is determined based on how many relevant and non-relevant documents are yielded based on the respective keyword, and generate a suggested set of keywords with a highest computed discriminatory power, wherein each keyword in the suggested set of keywords occurs within a same portion of a particular one of the plurality of documents that is textually subdivided into two or more portions, wherein each keyword in the suggested set of keywords is external to the seed set of keywords, and wherein each keyword in the suggested set of keywords occurs more frequently in documents in the subset determined to be relevant than documents in the subset determined to be not relevant; and an output unit, implemented on the computing device, configured to provide the suggested set of keywords to a client, wherein the suggested set is used to perform a further search of the set of documents.
19. The system of claim 18 , wherein each keyword in the suggested set of keywords has a meaning similar to one or more keyword in the seed set of keywords.