8. A system comprising: one or more server devices to: identify a document based on two or more search terms; form a tree structure based on the document, the tree structure including a plurality of items; analyze a repetition of one or more tags in the tree structure; determine, based on analyzing the repetition of the one or more tags, that the plurality of items are associated with a list, in the tree structure, the list not being defined by a list tag, the list including a header, and each item, of the plurality of items associated with the list, including plurality of words that describe the item associated with the list; annotate the tree structure to indicate that the list is present; determine a metric associated with the two or more search terms in a first manner when the two or more search terms appear in a single item of the plurality of items associated with the list; determine the metric associated with the two or more search terms in a second manner when: a first search term, of the two or more search terms, appears in a first item of the plurality of items associated with the list, and a second search term, of the two or more search terms, appears in a second item of the plurality of items associated with the list, the first manner being different than the second manner; determine the metric associated with the two or more search terms in a third manner when: the first search term appears in the header, and the second search term appears in an item of the plurality of items associated with the list, the third manner being different than the first manner and the second manner; determine a score for the document based on the metric associated with the two or more search terms; and rank, based on the score, the document with respect to at least one other document.
8. A system comprising: one or more server devices to: identify a document based on two or more search terms; form a tree structure based on the document, the tree structure including a plurality of items; analyze a repetition of one or more tags in the tree structure; determine, based on analyzing the repetition of the one or more tags, that the plurality of items are associated with a list, in the tree structure, the list not being defined by a list tag, the list including a header, and each item, of the plurality of items associated with the list, including plurality of words that describe the item associated with the list; annotate the tree structure to indicate that the list is present; determine a metric associated with the two or more search terms in a first manner when the two or more search terms appear in a single item of the plurality of items associated with the list; determine the metric associated with the two or more search terms in a second manner when: a first search term, of the two or more search terms, appears in a first item of the plurality of items associated with the list, and a second search term, of the two or more search terms, appears in a second item of the plurality of items associated with the list, the first manner being different than the second manner; determine the metric associated with the two or more search terms in a third manner when: the first search term appears in the header, and the second search term appears in an item of the plurality of items associated with the list, the third manner being different than the first manner and the second manner; determine a score for the document based on the metric associated with the two or more search terms; and rank, based on the score, the document with respect to at least one other document. 14. The system of claim 8 , where the one or more server devices are further to: determine an existence of text below one of the header or a title of the tree structure; and determine, based on determining the existence of the text, that the text belongs to the header or the title.