Perhaps you should try some spelling variations:
battery investment » better investment, after investment, factory investment
investment series » investment services, investment barriers, investment treaties
debt investment » direct investment, direct investments, forest investment
went battery » test battery, ion battery, ev battery
current debt » currency debt

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. went battery investment costs ) OR ( h. current debt investment series ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. went battery investment costs ) or ( h. current debt investment series ))*.