Perhaps you should try some spelling variations:
investment demands » investment demand, investment funds, investment trends
investment flows » investment funds
based investment » fixed investment, best investment, bond investment
rent rates » heat rates, current rates, ascent rates
test based » text based, rest based, trust based

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. ((rent rates) OR (rent taxes)) investment flows ) OR ( h. test based investment demands ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. ((rent rates) OR (rent taxes)) investment flows ) or ( h. test based investment demands ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent rates) OR (rent taxes)) investment flows ) or ( h. test based investment demands ))*.