Perhaps you should try some spelling variations:
investment demand » investor demand
investment rate » investment climate
bond investment » bond investments, road investment, fund investment
heat rates » death rates, heat waves
heat rate » flat rate
test bond » test bed, test book, tests beyond

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. ((heat rates) OR (heat rate)) investment rate ) OR ( h. test bond investment demand ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. ((heat rates) or (heat rate)) investment rate ) or ( h. test bond investment demand ))*.