1. A computer-implemented method comprising: determining whether a current search query returns a threshold number of items; using a previously submitted query as a search query when the current search query does not return the threshold number of items; identifying an initial unit of measurement associated with a property and an initial numeric value for the initial unit of measurement within the search query; determining one or more units of measurement related to the initial unit of measurement; performing a mathematical conversion on the initial numeric value, wherein the one or more units of measurement related to the initial unit and the mathematical conversion are updated based on a popularity and/or a success of user-submitted search queries; automatically forming an expanded search query by expanding the search query to include at least one related unit of measurement associated with the property; identifying at least one other search term within the search query other than the initial unit of measurement and the initial numeric value; determining an alias of the at least one other search term, wherein the alias comprises a translation of the at least one other search term in another language and is included in the expanded search query, wherein the language comprises a natural language; and sending the expanded search query to a search engine to search a database, wherein the formation of the expanded search query is performed after the search query is received and prior to submitting the search query to the search engine, or separate from and off-line relative to search query operations.