Perhaps you should try some spelling variations:
"british critical system" » "british critic system", "british critic's system", "british critick system", "british critical systems", "british political system", "british practical system"
"british artic system" » "british critic system", "british anti system", "british art system", "british arctic system", "british karstic system", "british article system"

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: (("british artic system") OR ("british critical system")).
• Removing quotes may allow a broader search: (( british artic system ) or ( british critical system )).
• Adding a wildcard symbol may retrieve word variants: (("british artic system") or ("british critical system"))*.