Perhaps you should try some spelling variations:
investment choices » investment costs, investment process
investment period » investment series, investment policy, investment demand
debt investment » direct investment, direct investments, forest investment
heat sector » meat sector, health sector, heating sector
kept debt » net debt, debt debt

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. heat sector investment period ) OR ( h. kept debt investment choices ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. heat sector investment period ) OR ( h. kept debt investment choices ))*.