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