13. A non-transitory computer-readable medium having instructions stored thereon that, when executed by one or more processors, cause performance of operations comprising: identifying, by a computing system, that a user input at a first computing device selected, from among a set of search results provided to the first computing device responsive to a first query, a search result that references a first electronic document; generating, by the computing system and in response to identifying that the user input at the first computing device selected the search result that references the first electronic document, an association between the first electronic document and one or more terms derived from the first query; after generating the association between the first electronic document and the one or more terms derived from the first query: receiving a second query specified by a user of a second computing device; determining a relevance of the first electronic document to the second query based at least in part on a level of similarity between (i) the one or more terms derived from the first query and associated with the first electronic document and (ii) one or more second terms derived from the second query; generating a second set of search results responsive to the second query, including selecting or ranking the first electronic document represented in the second set of search results based on the determined relevance; and transmitting the second set of search results to the second computing device.
13. A non-transitory computer-readable medium having instructions stored thereon that, when executed by one or more processors, cause performance of operations comprising: identifying, by a computing system, that a user input at a first computing device selected, from among a set of search results provided to the first computing device responsive to a first query, a search result that references a first electronic document; generating, by the computing system and in response to identifying that the user input at the first computing device selected the search result that references the first electronic document, an association between the first electronic document and one or more terms derived from the first query; after generating the association between the first electronic document and the one or more terms derived from the first query: receiving a second query specified by a user of a second computing device; determining a relevance of the first electronic document to the second query based at least in part on a level of similarity between (i) the one or more terms derived from the first query and associated with the first electronic document and (ii) one or more second terms derived from the second query; generating a second set of search results responsive to the second query, including selecting or ranking the first electronic document represented in the second set of search results based on the determined relevance; and transmitting the second set of search results to the second computing device. 18. The non-transitory computer-readable medium of claim 13 , wherein the operations comprise increasing a ranking of a particular search result in the second set of search results as a result of the level of similarity between (i) the one or more terms derived from the first query and (ii) the one or more second terms derived from the second query.