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)
improvededededddeeede » improveededededddeeede (Expand Search), improvedededededddeeede (Expand Search), improveddededddeeede (Expand Search), improvedededddeeede (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 ((improvedd\ OR improvede\) OR improvededededddeeede )))~".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre improv\ ) OR (\ theatre ((improvedd\ OR improvede\) OR improvededededddeeede )))*.