1. A method for computerized identification and presentation of semantic themes occurring in a set of electronic documents, the method comprising: performing topic modeling on the set of documents thereby to yield a set of topics and for each topic, a topic-modeling output list of words; and using a processor performing a matching algorithm to match only a subset of each topic-modeling output list of words, to the output list's corresponding topic, thereby to define respective subsets of words, such that each word appears in no more than a predetermined number of subsets from among said subsets.