8. The method of claim 1 , wherein the at least one additional inquiry parameter is non-duplicative of the extracted plurality of inquiry parameters and wherein at least one of the additional parallel searches comprises searching a respective one of the candidate indices to which the at least one additional inquiry parameter corresponds and to which none of the extracted plurality of inquiry parameters corresponds.
8. The method of claim 1 , wherein the at least one additional inquiry parameter is non-duplicative of the extracted plurality of inquiry parameters and wherein at least one of the additional parallel searches comprises searching a respective one of the candidate indices to which the at least one additional inquiry parameter corresponds and to which none of the extracted plurality of inquiry parameters corresponds. 9. The method of claim 8 , further comprising obtaining the at least one additional inquiry parameter from the parallel searches by performing operations comprising: determining from at least one of the plurality of general indices that first data from a one of the plurality of data sources is related to second data from a second one of the plurality of data sources; and obtaining the at least one additional inquiry parameter from the second data based on (i) the second data being related to the first data and (ii) the first data corresponding to at least some of the extracted plurality of inquiry parameters.