1. A method of suggesting keywords for a litigation hold, comprising: receiving a seed set of keywords; identifying, by one or more processing devices, a set of documents corresponding to the seed set of keywords; determining an indication of relevance for each document in a subset of the set of documents, wherein the subset comprises a plurality of documents, and wherein the indication of relevance for each document comprises a specified percentage degree of relevance of the document to the seed set of keywords; computing 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; generating, by one or more processing devices, 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; and providing the suggested set of keywords to a client, wherein the suggested set is used to perform a further search of the set of documents.