Perhaps you should try some spelling variations:
investment period » investment series, investment policy, adjustment period
water investment » water investments, after investment, rates investment
water payment » late payment, rate payment, based payment
kept water » melt water, ment water, peat water
dept water » melt water, ment water, peat water

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