Perhaps you should try some spelling variations:
"general operating" » "general operations", "general operation", "general operative"
"general relative" » "general relating", "general relations", "general operative"
"general relation" » "general relations", "general regulations", "general revolution"
"general relativity" » "general relatively"

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: (("general relativity") OR ((((("general relative") OR ("general operating"))) OR ("general relation")))).
• Removing quotes may allow a broader search: (( general relativity ) or ((((( general relative ) or ( general operating ))) or ( general relation )))).
• Adding a wildcard symbol may retrieve word variants: (("general relativity") or ((((("general relative") or ("general operating"))) or ("general relation"))))*.