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