Perhaps you should try some spelling variations:
investment period » investment series, investment policy, adjustment period
green investment » foreign investment, direct investment, forest investment
payments service » payments services, payment service, payment services
maize green » maize grain, maize grains
debt cash » debt cost, debt has

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. maize green investment period ) or ( h. debt cash payments service ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. maize green investment period ) OR ( h. debt cash payments service )).
• Adding a wildcard symbol may retrieve word variants: (( h. maize green investment period ) or ( h. debt cash payments service ))*.