Perhaps you should try some spelling variations:
aggregate functions » aggregation functions
aggregate fraction » aggregate reaction, aggregate function, aggregate extraction
functions income » functional income, functions come, functions inline
fraction income » section income, transaction income, graduation income

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: (( aggregate functions income distribution ) OR ( aggregate fraction income distribution )).
• Adding a wildcard symbol may retrieve word variants: (( aggregate functions income distribution ) or ( aggregate fraction income distribution ))*.