Perhaps you should try some spelling variations:
investment rates » investment rate, investment banks, investment flows
road investment » fixed investment
investment bank » investment funds
rent based » agent based, rank based, report based
test based » forest based, result based
ring » bring, wing, ping

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