Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment banks
investment series » investment services, investment barriers, investment treaties
rates investment » notes investment, water investment, related investment
rent based » rank based, test based, report based
melt rates » heat rates, melt water

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. ((rent based) OR (agent based)) investment series ) OR ( h. melt rates investment demands ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. ((rent based) OR (agent based)) investment series ) or ( h. melt rates investment demands ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent based) OR (agent based)) investment series ) or ( h. melt rates investment demands ))*.