38. The system of claim 37 wherein the ranking module is configured to determine the relevancy ranking value for each document as a document relevance (DR) value based on a ratio comprising the term weight (TW) value in a numerator of the ratio and the term frequency (TF) value in a denominator of the ratio.
39. The system of claim 38 wherein the ranking module is configured to calculate the DR value according to an equation comprising: DR = TW 3 TF + 1.