13. The computer system of claim 12 , wherein ranking comprises receiving an initial ranking of the search result items and re-ranking the search result items, the re-ranking being based at least in part on a query reading level representation for the query and reading difficulty level representations for the search result items.
13. The computer system of claim 12 , wherein ranking comprises receiving an initial ranking of the search result items and re-ranking the search result items, the re-ranking being based at least in part on a query reading level representation for the query and reading difficulty level representations for the search result items. 14. The computer system of claim 13 , wherein the re-ranking is based at least in part on the initial ranking.