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)
improvededddeddeed\ » improveededddeddeed\ (Expand Search), improvedededddeddeed\ (Expand Search), improveddddeddeed\ (Expand Search), improvedddeddeed\ (Expand Search)
improvededed » improveededed (Expand Search), improvedededed (Expand Search), improvedded (Expand Search), improveded (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 improvededddeddeed\) OR improvededed )))~".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre improv\ ) OR (\ theatre ((improvede\ OR improvededddeddeed\) OR improvededed )))*.