A computer implemented method, and a software product for directing a search aided by a set of topics, the topics not necessarily having a hierarchy. Each topic is attached to at least one information item of a plurality of information items, such as a Web page identified by a URL. The method includes identifying one or more information items of the plurality of information items, and determining one or more suggested topics from the set of topics according to the attachments of the suggested topics to the identified information items, and providing search results to the user including at least some of the identified information items and at least one of the suggested topics. Selecting one of the suggested topics generates a new set of suggested topics, such that a hierarchy of topics is formed on the fly for a particular search.