1. A computer-implemented method, the method comprising: obtaining, in a server device, a plurality of first search results responsive to a first search query, the plurality of first search results being ranked in an order; generating a second search query comprising the first search query and a synonym of a term in the first search query; obtaining a plurality of second search results responsive to the second search query; determining that a particular first search result responsive to the first search query appears within a threshold number of highest-ranked second search results responsive to the second search query; determining that the particular first search result in the first search results responsive to the first search query is not within a threshold number of highest-ranked first search results of the first search results responsive to the first search query; in response to determining that the particular first search result responsive to the first search query appears within the threshold number of the highest-ranked second search results responsive to the second search query and the particular first search result in the first search results responsive to the first search query is not within a threshold number of highest-ranked first search results of the first search results responsive to the first search query, modifying the order of the plurality of first search results by moving the particular first search result within the plurality of first search results from an original position in the order to a second, different position in the order, wherein the second position is higher than the original position; and providing the modified plurality of first search results in response to the first search query.