Perhaps you should try some spelling variations:
investment period » investment series, investment policy, investment demand
based investment » fixed investment, best investment, bond investment
payment service » payment services, employment service
based payment » based payments, card payment, based employment
kent based » agent based, test based

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

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