Perhaps you should try some spelling variations:
investment treaty » investment treaties, investment trusts, investment targets
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 treaty ) 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 treaty ) OR ( h. agent based investment period )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( h. ((rent water) OR (melt water)) investment treaty ) or ( h. agent based investment period ))".
• Adding a wildcard symbol may retrieve word variants: (( h. ((rent water) OR (melt water)) investment treaty ) or ( h. agent based investment period ))*.