Perhaps you should try some spelling variations:
improv\ » improve\ (Expand Search), improved\ (Expand Search)
improveedd\ » improveeedd\ (Expand Search), improvedeedd\ (Expand Search), improved\ (Expand Search)
improvedee\ » improveedee\ (Expand Search), improvededee\ (Expand Search), improved\ (Expand Search), improvede\ (Expand Search), improvee\ (Expand Search)
improvedede » improveedede (Expand Search), improvededede (Expand Search), improvedde (Expand Search), improvede (Expand Search)
improvede » improveede (Expand Search), improvedede (Expand Search), improved (Expand Search), improve (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 improveedd\) OR (improvedee\ OR improvedede ))) OR (\ theatre improvede ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ theatre ((improv\ OR improveedd\) OR (improvedee\ OR improvedede ))) OR (\ theatre improvede ))".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre ((improv\ OR improveedd\) OR (improvedee\ OR improvedede ))) OR (\ theatre improvede ))*.