9. The computing system of claim 8 , wherein the one or more hardware processors are further programmed, via the software instructions, to: receive input comprising at least the first concept; in response to the input, query the non-transitory computer storage to retrieve a result set based on the first concept and the index, the result set comprising at least the first segment and a second segment; and transmit the retrieved result set for presentation in a user interface, wherein the ranking affects the presentation of the first segment and the second segment in the user interface.
11. The computing system of claim 9 , wherein the input further comprises a second concept, and wherein the ranking is further based at least on a relationship R, wherein relationship R is defined substantially as: 
 ∝*geometric mean( P )*quantity of P −(1−∝)*sum(0), where ∝ is a constant, P comprises a first density of at least the first concept and the second concept in the first segment, and O comprises a second density of one or more other concepts in the first segment, wherein the one or more other concepts do not include at least the first concept and the second concept.