Abstract: A query generation system includes memory hardware configured to store instructions and processor hardware configured to execute the instructions. The instructions include obtaining a definition of a query specifying a number of elements of the query. The instructions include identifying candidate query elements for the query that correspond to a set of multiple domains. The instructions include, based on the specified number, determining a target number for each of the domains. The instructions include optimizing a selection of query elements from among the candidates. Using data from prior queries, the optimization maximizes at least one of internal consistency of the selected query elements and correlation of the selected query elements with a reference query. The optimization selects the target number of query elements for the domains. The instructions include storing the selected query elements.