Perhaps you should try some spelling variations:
investment periods » investment period, investment series, investment operations
investors demand » investor demand, investor demands, investment demand
rate investment » rates investment, trade investment, water investment
bank investors » bond investors, fund investors
heat rate » flat rate
kept bank » west bank, pt bank, debt bank

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. heat rate investment periods ) OR ( h. kept bank investors demand ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. heat rate investment periods ) or ( h. kept bank investors demand ))*.