1. A computer-implemented method comprising: processing a query to identify a set of item listings, each item listing associated with an item or service being offered and assigned to a leaf-level category; determining a scope of the query based on a dictionary of queries or a length of the query when the query is not found in the dictionary; identifying one or more categories based on the scope of the query; and presenting a search results page with the item listings from the identified one or more categories.