Perhaps you should try some spelling variations:
aggregate functional » aggregate function, aggregation functional, aggregate fraction
aggregate functions » aggregation functions
functional income » functional outcome, national income, functional genome
functions income » functions come, functions inline, functions inside

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