1. A computer-implemented method for searching a collection of content, comprising: detecting at least one interaction with search result content, the search result content part of a collection of content provided through an electronic marketplace; detecting at least one fixed phrase based at least in part on the detected at least one interaction with the search result content, the search result content associated with a column in a relevance matrix, the relevance matrix maintained in a data store in a distributed environment that utilizes a plurality of network resources available over a network, the at least one fixed phrase associated with a row in the relevance matrix, the relevance matrix corresponding to a data structure of a content index that indexes the collection of content; determining a position in the relevance matrix corresponding to an intersection of the column and the row; retrieving at least one relevance score at the position to identify at least one determined relevance score for facilitating a search; and updating the content index based at least in part on the at least one interaction and the at least one determined relevance score, the at least one determined relevance score being included in another search of the content index upon updating the relevance matrix.