Perhaps you should try some spelling variations:
"international watercourses" » "international patientcourses", "international lawcourses", "international tradecourses"
"international water" » "international patient", "international law", "international trade"
"international actors" » "international editions"
"international actor" » "international edition"

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("international watercourses") or ("international actors"))) or ((("international water") OR ("international actor"))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("international watercourses") OR ("international actors"))) OR ((("international water") OR ("international actor")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"international watercourses\") or (\"international actors\"))) or (((\"international water\") OR (\"international actor\"))))".
• Removing quotes may allow a broader search: (((( international watercourses ) or ( international actors ))) or ((( international water ) OR ( international actor )))).
• Adding a wildcard symbol may retrieve word variants: (((("international watercourses") or ("international actors"))) or ((("international water") OR ("international actor"))))*.