Perhaps you should try some spelling variations:
improv\ » improve\ (Expand Search), improved\ (Expand Search)
improveee\ » improveeee\ (Expand Search), improvedeee\ (Expand Search), improve\ (Expand Search), improved\ (Expand Search), improvee\ (Expand Search), improvede\ (Expand Search)
improvedd » improveedd (Expand Search), improvededd (Expand Search), improved (Expand Search), improve (Expand Search)
improveeeeede » improveeeeeede (Expand Search), improvedeeeeede (Expand Search), improveeede (Expand Search), improvedeede (Expand Search), improveeeede (Expand Search), improvedeeede (Expand Search)
improvee » improveee (Expand Search), improvedee (Expand Search), improve (Expand Search), improved (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 improveee\) OR improvedd ) OR improveeeeede )) OR (\ theatre improvee ))~".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre (((improv\ OR improveee\) OR improvedd ) OR improveeeeede )) OR (\ theatre improvee ))*.