Perhaps you should try some spelling variations:
improv\ » improve\ (Expand Search), improved\ (Expand Search)
improvede » improveede (Expand Search), improvedede (Expand Search), improved (Expand Search), improve (Expand Search)
improveede » improveeede (Expand Search), improvedeede (Expand Search), improved (Expand Search)
improveded » improveeded (Expand Search), improvededed (Expand Search), improvedd (Expand Search), improved (Expand Search)
improveeedde » improveeeedde (Expand Search), improvedeeedde (Expand Search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((\ theatre ((improv\ OR (improvede OR improveede) ) OR improveded )) OR (\ theatre improveeedde ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ theatre ((improv\ OR (improvede OR improveede) ) OR improveded )) OR (\ theatre improveeedde ))".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre ((improv\ OR (improvede OR improveede) ) OR improveded )) OR (\ theatre improveeedde ))*.