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)
improveded » improveeded (Expand Search), improvededed (Expand Search), improvedd (Expand Search), improved (Expand Search)
improvededeedededeede » improveededeedededeede (Expand Search), improvedededeedededeede (Expand Search), improveddeedededeede (Expand Search), improvedeedededeede (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 improvede\) OR improveded )) OR (\\ theatre improvededeedededeede ))~".
• Adding a wildcard symbol may retrieve word variants: \ ((\\ theatre ((improv\ OR improvede\) OR improveded )) OR (\\ theatre improvededeedededeede ))*.