21. A system comprising: a storage medium having instructions stored thereon; and data processing apparatus programmed to execute the instructions to perform operations comprising: receiving a search query in a first language; receiving a plurality of search results responsive to the search query, wherein the search results comprise one or more first search results and a plurality of second search results, wherein each first result identifies a respective document in the first language and a corresponding respective document in a different second language, and wherein the second search results each identify a respective document in the first language; ordering the search results based on, at least, a respective number of documents identified by each of the search results; and providing the ordered search results in response to the search query.
23. The system of claim 21 wherein a particular document in the second language is a document originating in the second language concerning a topic similar to a topic of the corresponding document in the first language.