Perhaps you should try some spelling variations:
investment demand » investor demand
based investment » best investment, bond investment, related investment
investment flows » investment funds
fixed investment » direct investment
test based » text based, rest based, trust based
ring fixed » trading fixed, facing fixed, voting fixed

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. test based investment flows ) OR ( h. ring fixed investment demand ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. test based investment flows ) or ( h. ring fixed investment demand ))*.