Perhaps you should try some spelling variations:
investment period » investment series, investment policy, adjustment period
payment series » payment services, payments services, payment service
based payment » based payments, card payment, based cement
kept based » depth based, text based, set based
kent term » kent cem, key term

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 term investment period ) or ( h. kept based payment series ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. kent term investment period ) OR ( h. kept based payment series )).
• Adding a wildcard symbol may retrieve word variants: (( h. kent term investment period ) or ( h. kept based payment series ))*.