12. The method of claim 11 , further comprising implementing the phrase length pre-filtering component to compare the phrase length of the input user query with an exact match index entry and filter out the exact match index entry if a phrase of the exact match index entry has fewer characters than the input user query.
11. The method of claim 10 , further comprising implementing a phrase length pre-filtering component for comparing a phrase length of each matching index entry with a phrase length of the input user query.