Search Tool Using Multiple Different Search Engine Types Across Different Data Sets

Various embodiments provide for use of multiple different search engines. The individual search engines are configured to conduct searches in different ways across a search space that includes different types of data sets. In at least some embodiments, the type of search engine that is utilized is selected to due characteristics of the data set(s) that is (are) to be searched. In search spaces that include different types of data sets, combining and mixing different search engines to collectively search the search space can provide a desirably fast and robust user experience.