Perhaps you should try some spelling variations:
"cornelis gilbert gerrit jan jan steensel" » "cornelis gilbert gerrit jan van steensel" (Expand Search), "cornelis gilbert geert jan jan steensel" (Expand Search), "cornelis gilbert gerrit janse jan steensel" (Expand Search), "cornelis gilbert gerrit jang jae steensel" (Expand Search), "cornelis gilbert gerrit kuan jan steensel" (Expand Search)
"cornelis gilbert gerrit tang van steenis" » "cornelis gilbert gerrit tang van steensel" (Expand Search), "cornelis gilbert gerrit tang yan steenis" (Expand Search), "cornelis gilbert gerrit dang van steenis" (Expand Search), "cornelis gilbert gerrit tang fan steenis" (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: (("cornelis gilbert gerrit tang van steenis") OR ("cornelis gilbert gerrit jan jan steensel"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cornelis gilbert gerrit tang van steenis\") OR (\"cornelis gilbert gerrit jan jan steensel\"))".
• Removing quotes may allow a broader search: (( cornelis gilbert gerrit tang van steenis ) OR ( cornelis gilbert gerrit jan jan steensel )).
• Adding a wildcard symbol may retrieve word variants: (("cornelis gilbert gerrit tang van steenis") OR ("cornelis gilbert gerrit jan jan steensel"))*.