Perhaps you should try some spelling variations:
investment treaties » investment strategies, investment activities, investment incentives
investment period » investment series, investment policy, adjustment period
based investment » fixed investment, best investment, bond investment
rent water » ment water, peat water, want water
melt water » salt water

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( h. ((rent water) or (melt water)) investment treaties ) or ( h. agent based investment period ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( h. ((rent water) OR (melt water)) investment treaties ) OR ( h. agent based investment period )).
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent water) or (melt water)) investment treaties ) or ( h. agent based investment period ))*.