Perhaps you should try some spelling variations:
british class » british coasts, british case, british coast
british claim » british coal, british civil, british crime
"british mass system" » "british mars system", "british muses system", "british made 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 class) OR (british claim)) system") OR ("british mass system")).
• Removing quotes may allow a broader search: (( ((british class) OR (british claim)) system ) or ( british mass system )).
• Adding a wildcard symbol may retrieve word variants: (("((british class) OR (british claim)) system") or ("british mass system"))*.