1. A method comprising: extracting a plurality of first titles of a plurality of respective first wiki articles that corresponds to a plurality of respective links that are associated with a second wiki article, the second wiki article having a second title that is associated with a designated query intent, to provide an initial key term set that includes the plurality of first titles and the second title; correlating each of the plurality of first titles and the second title with at least one respective clicked uniform resource identifier using a search click log; expanding the initial key term set to include search terms, in addition to the plurality of first titles and the second title, that are correlated to the clicked uniform resource identifiers based on the search click log to provide an expanded key term set; and training a search query intent classifier to classify search queries with respect to the designated query intent based on the expanded key term set.