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)
improveeed » improveeeed (Expand Search), improvedeeed (Expand Search), improved (Expand Search)
improveddd » improveeddd (Expand Search), improvededdd (Expand Search), improvedd (Expand Search), improved (Expand Search)
improvedee » improveedee (Expand Search), improvededee (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 improvedd\) OR improveeed ) OR improveddd )) OR (\ theatre improvedee ))~".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre (((improv\ OR improvedd\) OR improveeed ) OR improveddd )) OR (\ theatre improvedee ))*.