Perhaps you should try some spelling variations:
investment demand » investor demand
based investment » fixed investment, best investment, bond investment
investment rates » investment rate
roads investment » road investment, road investments, gross investment
rent based » rest based, agent based, event based
ring roads » ring road

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 investment rates ) OR ( h. ring roads investment demand ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. rent based investment rates ) or ( h. ring roads investment demand ))*.