Perhaps you should try some spelling variations:
investment period » investment series, investment policy, investment demand
scale investment » estate investment, trade investment, estate investments
best investment » debt investment, net investment, forest investment
investment ties » investment does, investment series, investment trends
kent scale » likert scale

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 best investment period ) OR ( h. kent scale investment ties ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. kent best investment period ) or ( h. kent scale investment ties ))*.