Perhaps you should try some spelling variations:
investment services » government services, treatment services, investment choices
rates investment » notes investment, rules investment, water investment
investment flows » investment funds
rent based » rest based, agent based, event based
test based » text based, rest based, trust based
heat rates » heat rate, death rates, heat waves

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. ((rent based) or (test based)) investment services ) or ( h. heat rates investment flows ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. ((rent based) OR (test based)) investment services ) OR ( h. heat rates investment flows )).
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent based) or (test based)) investment services ) or ( h. heat rates investment flows ))*.