Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment banks
rates investment » notes investment, water investment, related investment
investment rates » investment rate, investment banks, investment flows
based investment » fixed investment, best investment, bond investment
rent rates » heat rates, rent taxes, current rates
test based » forest based, result based

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. rent rates investment rates ) or ( h. test based investment demands ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. rent rates investment rates ) OR ( h. test based investment demands )).
• Adding a wildcard symbol may retrieve word variants: (( h. rent rates investment rates ) or ( h. test based investment demands ))*.