Perhaps you should try some spelling variations:
financial activities » financing activities, financial liabilities, microbial activities
general activity » neural activity, gene activity, genetic activity
central activity » mental activity, cultural activity, neural activity

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: ((financial activities) OR (((general activity) OR (central activity)))).
• Adding a wildcard symbol may retrieve word variants: ((financial activities) or (((general activity) or (central activity))))*.