Perhaps you should try some spelling variations:
investment series » investment services, investment barriers, investment treaties
based investment » fixed investment, best investment, bond investment
forest based » forest area
rent based » rest based, agent based, event based
rank based » bank based, banks based, risk 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 based) or (rank based)) investment series ) or ( h. forest based investment costs ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. ((rent based) OR (rank based)) investment series ) OR ( h. forest based investment costs )).
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent based) or (rank based)) investment series ) or ( h. forest based investment costs ))*.