Perhaps you should try some spelling variations:
investment periods » investment period, investment series, investment operations
rates investment » notes investment, water investment, related investment
melt rates » heat rates
dept water » deep water
melt water » salt water
services » series

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 rates investment periods ) OR ( h. ((dept water) OR (melt water)) payment services ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. melt rates investment periods ) or ( h. ((dept water) OR (melt water)) payment services ))~".
• Adding a wildcard symbol may retrieve word variants: (( h. melt rates investment periods ) or ( h. ((dept water) OR (melt water)) payment services ))*.