Perhaps you should try some spelling variations:
improv\ » improve\ (Expand Search), improved\ (Expand Search)
improveeedd\ » improveeeedd\ (Expand Search), improvedeeedd\ (Expand Search), improvedd\ (Expand Search), improveddd\ (Expand Search), improveedd\ (Expand Search), improvededd\ (Expand Search)
improveee\ » improveeee\ (Expand Search), improvedeee\ (Expand Search), improve\ (Expand Search), improved\ (Expand Search), improvee\ (Expand Search), improvede\ (Expand Search)
improvee » improveee (Expand Search), improvedee (Expand Search), improve (Expand Search), improved (Expand Search)
improveed » improveeed (Expand Search), improvedeed (Expand Search), improved (Expand Search), improvedd (Expand Search), improve (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 improveeedd\) OR (improveee\ OR improvee ))) OR (\ theatre improveed ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ theatre ((improv\ OR improveeedd\) OR (improveee\ OR improvee ))) OR (\ theatre improveed ))".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre ((improv\ OR improveeedd\) OR (improveee\ OR improvee ))) OR (\ theatre improveed ))*.