Perhaps you should try some spelling variations:
"general revolution" » "general solution", "general solutions", "generalized solution"
"general relative" » "general relation", "general relating", "general relations"
"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 revolution")))).
• Removing quotes may allow a broader search: (( general relativity ) or ((( general relative ) or ( general revolution )))).
• Adding a wildcard symbol may retrieve word variants: (("general relativity") or ((("general relative") or ("general revolution"))))*.