Perhaps you should try some spelling variations:
"supply european integration theory." » "supply european integration through.", "supply european information theory.", "supply european integration report.", "supply europe integration theory."
"supply ocean conservation efforts." » "supply local conservation efforts.", "supply area conservation efforts.", "supply forest conservation efforts.", "supply social conservation efforts.", "supply chain conservation efforts.", "supply urban conservation efforts."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply european integration theory.") or ("supply ocean conservation efforts."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply european integration theory.") OR ("supply ocean conservation efforts.")).
• Removing quotes may allow a broader search: (( supply european integration theory. ) or ( supply ocean conservation efforts. )).
• Adding a wildcard symbol may retrieve word variants: (("supply european integration theory.") or ("supply ocean conservation efforts."))*.