Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment trends
rates investment » notes investment, rules investment, water investment
investment rates » investment rate
death rates » death rate
kent rates » heat rates, ascent rates, events rates

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. death rates investment rates ) OR ( h. kent rates investment demands ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. death rates investment rates ) or ( h. kent rates investment demands ))*.