Perhaps you should try some spelling variations:
investment demand » investor demand
gross investment » group investment, growth investment, trusts investments
investment rates » investment rate
rates investment » notes investment, rules investment, water investment
heat gross » real gross, heat loss
kent rates » heat rates, ascent rates, events rates

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

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