1. A method, comprising: obtaining a set of clauses in a first set of content items comprising unstructured data; obtaining a set of stop words comprising high-frequency words that occur in a second set of content items; and automatically extracting, by one or more computer systems, a set of topics from the set of clauses by: generating a set of n-grams from the set of clauses; and excluding a first n-gram in the set of n-grams from the set of topics when the first n-gram contains a word in the set of stop words in a pre-specified position of the first n-gram; and displaying, by the one or more computer systems, the set of topics to a user to improve understanding of the first set of content items by the user without requiring the user to manually analyze the first set of content items.