15. A system comprising one or more computers and one or more storage devices storing instructions that when executed by the one or more computers cause the one or more computers to perform operations comprising: determining that a first search query includes a respective text reference to each of one or more predetermined attributes, wherein each attribute is associated with a first entity type; for each of a plurality of entities of the first entity type, generating a combined search query that includes the first search query and a name of the entity; obtaining search results for each of the plurality of entities using the combined search query for each respective entity; and using the obtained search results to generate combined search results to include in a response to the first search query, wherein using the obtained search results to generate combined search results comprises: generating a respective combined score for each of a plurality of resources identified by the obtained search results, wherein the respective combined score for each resource is a combination of scores associated with obtained search results identifying the resource, and wherein generating the respective combined score for each of the resources comprises: identifying a plurality of search results identifying the resource, wherein each search result identifying the resource is obtained from the search engine in response to a respective combined query, and wherein each search result identifying the resource is associated with a respective first score, and generating the combined score for the resource by combining the first scores associated with the search results is the resource; and ranking the obtained search results based on the combined scores for the respective resources identified by each search result.
15. A system comprising one or more computers and one or more storage devices storing instructions that when executed by the one or more computers cause the one or more computers to perform operations comprising: determining that a first search query includes a respective text reference to each of one or more predetermined attributes, wherein each attribute is associated with a first entity type; for each of a plurality of entities of the first entity type, generating a combined search query that includes the first search query and a name of the entity; obtaining search results for each of the plurality of entities using the combined search query for each respective entity; and using the obtained search results to generate combined search results to include in a response to the first search query, wherein using the obtained search results to generate combined search results comprises: generating a respective combined score for each of a plurality of resources identified by the obtained search results, wherein the respective combined score for each resource is a combination of scores associated with obtained search results identifying the resource, and wherein generating the respective combined score for each of the resources comprises: identifying a plurality of search results identifying the resource, wherein each search result identifying the resource is obtained from the search engine in response to a respective combined query, and wherein each search result identifying the resource is associated with a respective first score, and generating the combined score for the resource by combining the first scores associated with the search results is the resource; and ranking the obtained search results based on the combined scores for the respective resources identified by each search result. 17. The system of claim 15 , the operations further comprising: receiving the first search query from a user device; and providing the combined search results to the user device for presentation in a user interface.