11. The system of claim 8 , wherein the query enhancer component further comprises a sub-pattern generator component to derive the error sub-patterns from the error patterns.
11. The system of claim 8 , wherein the query enhancer component further comprises a sub-pattern generator component to derive the error sub-patterns from the error patterns. 12. The system of claim 11 , wherein each error sub-pattern is one of the error messages input to the search engines.