Perhaps you should try some spelling variations:
investment demand » investor demand
rates investment » notes investment, rules investment, water investment
debt investment » direct investment, direct investments, forest investment
heat rates » heat rate, death rates, heat waves
test debt » net debt, test der, past debt

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