2. The system of claim 1 , wherein: determining that a term of the original query meets an inaccuracy criterion comprises determining that the term is typographically incorrect; generating one or more derivative queries from the original query comprises generating a derivative query that includes only the terms of the original query that are not the potentially inaccurate term.
2. The system of claim 1 , wherein: determining that a term of the original query meets an inaccuracy criterion comprises determining that the term is typographically incorrect; generating one or more derivative queries from the original query comprises generating a derivative query that includes only the terms of the original query that are not the potentially inaccurate term. 3. The system of claim 2 , wherein determining that the term is typographically incorrect comprises determining a synonym quality measure that is a measure of quality of synonym terms that are synonyms of the term does not meet a synonym quality measure threshold.