Perhaps you should try some spelling variations:
investment demand » investor demand
rates investment » notes investment, rules investment, water investment
best investment » debt investment, net investment, forest investment
heat rates » heat rate, death rates, heat waves
test best » test test, west best, test bed

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 rates investment climate ) or ( h. test best investment demand ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. heat rates investment climate ) OR ( h. test best investment demand )).
• Adding a wildcard symbol may retrieve word variants: (( h. heat rates investment climate ) or ( h. test best investment demand ))*.