Perhaps you should try some spelling variations:
"William Shakespeare's collaboratorers" » "William Shakespeare's colaboradores", "William Shakespeare's collaboraterers", "William Shakespeare's collaborationrers", "William Shakespeare's collaborativerers"
"William Shakespeare's collaborators" » "William Shakespeare's collaboraters", "William Shakespeare's collaborationrs", "William Shakespeare's collaborativers"
"William Shakespeare's collaboratore" » "William Shakespeare's collaboratere", "William Shakespeare's collaborationre", "William Shakespeare's collaborativere"
"William Shakespeare's collaborato" » "William Shakespeare's collaborate", "William Shakespeare's collaboration", "William Shakespeare's collaborative"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("William Shakespeare's collaborations") OR ((((("William Shakespeare's collaborators") OR ((("William Shakespeare's collaboratorers") OR ("William Shakespeare's collaboratore"))))) OR ("William Shakespeare's collaborato"))))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"William Shakespeare's collaborations\") OR (((((\"William Shakespeare's collaborators\") OR (((\"William Shakespeare's collaboratorers\") OR (\"William Shakespeare's collaboratore\"))))) OR (\"William Shakespeare's collaborato\"))))".
• Removing quotes may allow a broader search: (( William Shakespeare's collaborations ) OR ((((( William Shakespeare's collaborators ) OR ((( William Shakespeare's collaboratorers ) OR ( William Shakespeare's collaboratore ))))) OR ( William Shakespeare's collaborato )))).
• Adding a wildcard symbol may retrieve word variants: (("William Shakespeare's collaborations") OR ((((("William Shakespeare's collaborators") OR ((("William Shakespeare's collaboratorers") OR ("William Shakespeare's collaboratore"))))) OR ("William Shakespeare's collaborato"))))*.