Perhaps you should try some spelling variations:
government services » government securities
states government » state government, state governments, systems government
investment period » investment series, investment policy, investment demand
based investment » fixed investment, best investment, bond investment
report based » export base, report card

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. report based investment period ) OR ( h. depth states government services ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. report based investment period ) or ( h. depth states government services ))*.