Perhaps you should try some spelling variations:
investment period » investment series, investment policy, investment demand
water investment » water investments, rates investment, greater investment
payment series » payment services, payments services, payment service
rate payment » rate payments, late payment, late payments
melt water » salt water
dept rate » death rate, heat rate, deposit rate

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. melt water investment period ) OR ( h. dept rate payment series ))~.
• Adding a wildcard symbol may retrieve word variants: (( h. melt water investment period ) or ( h. dept rate payment series ))*.