10. A computing device comprising: one or more processors; and memory to maintain a plurality of components executable by the one or more processors, the plurality of components comprising: a first search module configured to: receive a query including a keyword, and conduct a search to obtain a first set of search results based on literal correlations with the keyword; a second search module configured to determine a second set of search results including one or more search results that are not in the first set of search results, each individual search result of the second set of search results being determined based at least in part on correlations among the keyword and transactional parameters that individually satisfy at least one predetermined condition, each individual transactional parameter of the transactional parameters being determined based on a ratio of a number of users purchasing one or more items associated with the individual search result to a number of users investigating the individual search result; and a sorting search module configured to assign the second set of search results a higher priority than the first set of search results.
10. A computing device comprising: one or more processors; and memory to maintain a plurality of components executable by the one or more processors, the plurality of components comprising: a first search module configured to: receive a query including a keyword, and conduct a search to obtain a first set of search results based on literal correlations with the keyword; a second search module configured to determine a second set of search results including one or more search results that are not in the first set of search results, each individual search result of the second set of search results being determined based at least in part on correlations among the keyword and transactional parameters that individually satisfy at least one predetermined condition, each individual transactional parameter of the transactional parameters being determined based on a ratio of a number of users purchasing one or more items associated with the individual search result to a number of users investigating the individual search result; and a sorting search module configured to assign the second set of search results a higher priority than the first set of search results. 19. The computing device of claim 10 , wherein: the number of users purchasing one or more items associated with the individual search result represents a purchase index; the number of users investigating the individual search result represents a click index; and the individual transactional parameter is determined further based on a variance of purchase indexes of the second set of search results or a variance of click indexes of the second set of search results.