1. A computer-implemented method comprising: decomposing, by at least one processor of a computer system, a search query that includes three or more words into a plurality of candidate phrasifications, including different groupings of words of the search query, each candidate phrasification comprising a disjoint union of component phrases, and each component phrase including at least one word or related word of the search query; scoring, by at least one of the processors of the computer system, at least two of the candidate phrasifications, wherein the candidate phrasifications include one or more component phrases, and wherein the scoring is based on a probability of occurrence of each of the candidate phrasification's component phrases, and is based on the number of component phrases constituting the candidate phrasification, wherein candidate phrasifications having relatively fewer component phrases are weighted higher than candidate phrasifications having relatively more component phrases; selecting, by at least one of the processors of the computer system and based on scores of the candidate phrasifications, a subset of the candidate phrasification; and executing a query of a document indexing, by at least one of the processors of the computer system, using the selected subset of candidate phrasifications, wherein the query comprises the component phrases of each selected phrasification.
1. A computer-implemented method comprising: decomposing, by at least one processor of a computer system, a search query that includes three or more words into a plurality of candidate phrasifications, including different groupings of words of the search query, each candidate phrasification comprising a disjoint union of component phrases, and each component phrase including at least one word or related word of the search query; scoring, by at least one of the processors of the computer system, at least two of the candidate phrasifications, wherein the candidate phrasifications include one or more component phrases, and wherein the scoring is based on a probability of occurrence of each of the candidate phrasification's component phrases, and is based on the number of component phrases constituting the candidate phrasification, wherein candidate phrasifications having relatively fewer component phrases are weighted higher than candidate phrasifications having relatively more component phrases; selecting, by at least one of the processors of the computer system and based on scores of the candidate phrasifications, a subset of the candidate phrasification; and executing a query of a document indexing, by at least one of the processors of the computer system, using the selected subset of candidate phrasifications, wherein the query comprises the component phrases of each selected phrasification. 19. The method of claim 1 , wherein the phrase tree is rooted by an OR node.