Perhaps you should try some spelling variations:
direct investments » direct investment
investments series » investment series, investment services, investment period
investment demand » investment bank, investment fund, investor demand
based investment » fixed investment, best investment, bond investment
kent based » agent based, test 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. kent based investment demand ) OR ( h. kent direct investments series ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. kent based investment demand ) or ( h. kent direct investments series ))*.