Perhaps you should try some spelling variations:
"general operative" » "general operating", "general preoperative", "general comparative"
"general operation" » "general corporation", "several operations", "general operators"
"general relative" » "general relating", "general relations", "general ergative"
"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 operative") OR ("general operation"))))) OR ("general relation")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"general relativity\") or (((((\"general relative\") or (((\"general operative\") OR (\"general operation\"))))) or (\"general relation\"))))".
• Removing quotes may allow a broader search: (( general relativity ) or ((((( general relative ) or ((( general operative ) OR ( general operation ))))) or ( general relation )))).
• Adding a wildcard symbol may retrieve word variants: (("general relativity") or ((((("general relative") or ((("general operative") OR ("general operation"))))) or ("general relation"))))*.