Perhaps you should try some spelling variations:
investment demand » investor demand
investment rates » investment rate
rates investment » notes investment, rules investment, water investment
gain investment » brain investment, can investment, chains investment
ascent rates » accident rates, payment rates, ascent after
heat gain » health gain, health gains, wheat grains

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