Perhaps you should try some spelling variations:
investment trends » investment funds, investment treaty, investment trusts
based investment » fixed investment, best investment, bond investment
depth rates » death rates, death rate
depth cases » depth case, death cases, depth based
test based » text based, rest based, trust 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. test based investment trends ) or ( h. ((depth rates) OR (depth cases)) investment costs ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. test based investment trends ) OR ( h. ((depth rates) OR (depth cases)) investment costs )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. test based investment trends ) or ( h. ((depth rates) OR (depth cases)) investment costs ))".
• Adding a wildcard symbol may retrieve word variants: (( h. test based investment trends ) or ( h. ((depth rates) OR (depth cases)) investment costs ))*.