Perhaps you should try some spelling variations:
government services » government securities
rates investment » notes investment, rules investment, water investment
investment flows » investment funds
rank based » banks based, risk based, task based
bank based » task based
heat rates » heat rate, death rates, heat waves

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: (( h. ((rank based) OR (bank based)) government services ) OR ( h. heat rates investment flows ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. ((rank based) OR (bank based)) government services ) or ( h. heat rates investment flows ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. ((rank based) OR (bank based)) government services ) or ( h. heat rates investment flows ))*.