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