Perhaps you should try some spelling variations:
"general regulations" » "federal regulation", "gene regulation", "genetic regulation"
"general relations" » "general reflections", "temporal relations", "general observations"
"general equations" » "integral equations"
"general relative" » "general relation", "general relating", "general operative"
"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 relations") OR ("general regulations"))) OR ("general equations")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"general relativity\") or (((\"general relative\") or (((((\"general relations\") OR (\"general regulations\"))) or (\"general equations\"))))))".
• Removing quotes may allow a broader search: (( general relativity ) or ((( general relative ) or ((((( general relations ) OR ( general regulations ))) or ( general equations )))))).
• Adding a wildcard symbol may retrieve word variants: (("general relativity") or ((("general relative") or ((((("general relations") OR ("general regulations"))) or ("general equations"))))))*.