A search method is provided. The method comprises, building a first plurality of collectors, associating a first plurality of index entries with the first plurality of collectors, wherein each index entry comprises a search target and is associated with at least one of the first plurality of collectors based on a similarity between the search target of the index entry and the at least one collector, selecting a second plurality of collectors from among the first collectors based on a similarity between a search term and each of the second plurality of collectors, selecting a second plurality of index entries from among the index entries associated with the second plurality of collectors based on a similarity between the search term and the search target of each of the index entries associated with the second plurality of collectors, and presenting information related to the second plurality of index entries.