Perhaps you should try some spelling variations:
"klein kramers" » "klein kafer", "klein parameters"
"klein primer" » "ein primer", "klein daimler", "klein peter", "klein pricer", "klein crimer"
"klein prime" » "klein price", "klein crime"

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