13. The system of claim 12 , wherein the particular search result is responsive to the first search query but not within the threshold number of the highest ranked first search results; and wherein modifying the first search results includes moving the particular search result from an original position in the order to an improved position that is within the threshold number of highest-ranked first search results.
14. The system of claim 13 , wherein the original position of the particular search result is in a lower tier of the first search results and the second position is in a higher tier of the first search results.