Perhaps you should try some spelling variations:
british class » british coasts, british claim, british case
"British class system" » "British glass systems", "British loss system", "British cross system"
british mass » british mars, british muses, british made

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"British class system\") OR (\"British mass system\"))".
• Removing quotes may allow a broader search: (( British class system ) OR ( British mass system )).
• Adding a wildcard symbol may retrieve word variants: (("British class system") OR ("British mass system"))*.