Gustav, AFAIK, multi words synonyms is one of the weak points for Lucene/Solr. I'm going to propose a solution approach at forthcoming Eurocon http://www.apachecon.eu/schedule/presentation/18/ . You are welcome!
-- Sincerely yours Mikhail Khludnev Tech Lead Grid Dynamics <http://www.griddynamics.com> <mkhlud...@griddynamics.com>
