Perhaps you should try some spelling variations:
investment period » investment series, investment policy, adjustment period
based investment » fixed investment, best investment, bond investment
investment rates » investment rate
road investment » fixed investment
rent based » rest based, agent based, event based
rank road » trunk 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. rank road investment period ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. rent based investment rates ) or ( h. rank road investment period ))*.