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)
improvee\ » improveee\ (Expand Search), improvedee\ (Expand Search), improve\ (Expand Search), improved\ (Expand Search)
improvedede » improveedede (Expand Search), improvededede (Expand Search), improvedde (Expand Search), improvede (Expand Search)
improveeded » improveeeded (Expand Search), improvedeeded (Expand Search), improveded (Expand Search), improvedded (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 (((improvede\ OR improvee\) OR improvedede ) OR improveeded )))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ theatre improv\ ) OR (\ theatre (((improvede\ OR improvee\) OR improvedede ) OR improveeded )))".
• Adding a wildcard symbol may retrieve word variants: ((\ theatre improv\ ) OR (\ theatre (((improvede\ OR improvee\) OR improvedede ) OR improveeded )))*.