12. The system of claim 10 , wherein: determining that the particular term in the current search query is a potentially inaccurate term comprises determining that the particular term is included in a set of misspelled terms; and generating a modified search query comprises replacing the particular term with the different term.
13. The system of claim 12 , wherein the instructions cause the one or more data processing apparatus to perform operations further comprising: comparing the set of misspelled terms to the set of related terms; and determining, based on the comparing, that a matching term is included in each of the set of related terms and the set of misspelled terms, wherein: generating a modified search query comprises replacing the particular term with the matching term.