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)
improvededededede\ » improveededededede\ (Expand Search), improvedededededede\ (Expand Search), improveddededede\ (Expand Search), improvedededede\ (Expand Search)
improvededdde » improveededdde (Expand Search), improvedededdde (Expand Search), improvedddde (Expand Search), improveddde (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ theatre improv\ ) OR (\ theatre ((improvede\ OR improvededededede\) OR improvededdde )))~".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre improv\ ) OR (\ theatre ((improvede\ OR improvededededede\) OR improvededdde )))*.