Perhaps you should try some spelling variations:
biographical memoir » biographical memoirs, biographical methods
based federation » based generation, based federated, based operation
based separation » phase separation, based generation, based exploration

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: "((based federation) OR (based separation)) biographical memoir".
• Adding a wildcard symbol may retrieve word variants: ((based federation) OR (based separation)) biographical memoir*.