Perhaps you should try some spelling variations:
adjustment period » adjustment policy, adjustment operations
investment series » investment services, investment barriers, investment treaties
based investment » fixed investment, best investment, bond investment
result based » results based, report based, results case
test fixed » net fixed, testing fixed

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. result based investment series ) or ( h. ((test fixed) OR (test field)) adjustment period ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. result based investment series ) OR ( h. ((test fixed) OR (test field)) adjustment period )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. result based investment series ) or ( h. ((test fixed) OR (test field)) adjustment period ))".
• Adding a wildcard symbol may retrieve word variants: (( h. result based investment series ) or ( h. ((test fixed) OR (test field)) adjustment period ))*.