Perhaps you should try some spelling variations:
investment during » investment using, investment reducing, investment funding
social investment » capital investment, initial investment
investment series » investment services, investment barriers, investment treaties
kent rates » ascent rates, events rates
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. ((kent rates) OR (heat rates)) investment during ) OR ( h. joint social investment series ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. ((kent rates) OR (heat rates)) investment during ) or ( h. joint social investment series ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. ((kent rates) OR (heat rates)) investment during ) or ( h. joint social investment series ))*.