Perhaps you should try some spelling variations:
"cornelia gijsbert gerrit janse jan steenis" » "cornelia gijsbert gerrit janse van steenis" (Expand Search), "cornelia ginsberg gerrit janse jan steenis" (Expand Search)
"cornelis gilbert geert jan jan steenis" » "cornelis gilbert geert jang jae steenis" (Expand Search), "cornelis gilbert geert kuan jan steenis" (Expand Search), "cornelius gilbert geert jan jan steenis" (Expand Search), "dscornelis gilbert geert jan jan steenis" (Expand Search), "corners gilbert geert jan jan steenis" (Expand Search), "cornelis gilbert geertz jan jan steenis" (Expand Search), "cornelis gilbert geest jan jan steenis" (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: "((\"cornelis gilbert geert jan jan steenis\") OR (\"cornelia gijsbert gerrit janse jan steenis\"))~".
• Removing quotes may allow a broader search: (( cornelis gilbert geert jan jan steenis ) OR ( cornelia gijsbert gerrit janse jan steenis ))~.
• Adding a wildcard symbol may retrieve word variants: (("cornelis gilbert geert jan jan steenis") OR ("cornelia gijsbert gerrit janse jan steenis"))*.