Perhaps you should try some spelling variations:
"martin van turen" » "martin a turen", "martin von turen", "martin van duren", "martin van tuyen"
"martin van buren" » "martin a buren"
"martin van buen" » "martin a buen", "martin van buer", "martin van bueren", "martin van buuren"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("martin van turen") OR ((("martin van buren") OR ("martin van buen")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"martin van turen\") or (((\"martin van buren\") OR (\"martin van buen\"))))".
• Removing quotes may allow a broader search: (( martin van turen ) or ((( martin van buren ) OR ( martin van buen )))).
• Adding a wildcard symbol may retrieve word variants: (("martin van turen") or ((("martin van buren") OR ("martin van buen"))))*.