Integrated search portals on the Internet are able to simultaneously search in multiple and heterogeneous document collections containing millions of documents. The ViFaChem II project run by the TIB Hannover and the L3S Research Center develops extended modules for the chemistry portal chem.de, which aim to assist chemists in their search for the right piece of information by creating metadata enriched document collections, which will allow specialized search and navigation through query results taking into account individual retrieval strategies, thus forming a personalised knowledge space of chemistry.