Perhaps you should try some spelling variations:
"mark schwartz" » "mr schwartz", "a schwartz", "mark stewart"
"gary schwartz" » "barry schwartz", "a schwartz", "mr schwartz"
"gerd schwartz" » "chern schwartz", "d schwartz", "mr schwartz"

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: (("mark schwartz") OR ((("gary schwartz") OR ("gerd schwartz")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mark schwartz\") or (((\"gary schwartz\") OR (\"gerd schwartz\"))))".
• Removing quotes may allow a broader search: (( mark schwartz ) or ((( gary schwartz ) OR ( gerd schwartz )))).
• Adding a wildcard symbol may retrieve word variants: (("mark schwartz") or ((("gary schwartz") OR ("gerd schwartz"))))*.