Perhaps you should try some spelling variations:
investments series » investment series, investments serbia, investments sri
based investments » based investment, fixed investments, bond investments
kent based » agent based, event based, text based
kent scale » event scale, likert scale
debt scale » debt sales, debt scaling

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. kent based investments series ) OR ( h. ((kent scale) OR (debt scale)) investments series ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. kent based investments series ) or ( h. ((kent scale) OR (debt scale)) investments series ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. kent based investments series ) or ( h. ((kent scale) OR (debt scale)) investments series ))*.