Perhaps you should try some spelling variations:
"supply assets integrating countries." » "supply assets importing countries.", "supply assets immigration countries.", "supply assets integrating culture.", "supply market integrating countries.", "supply models integrating countries.", "supply waves integrating countries.", "supply costs integrating countries."
"supply vertical integration theorems." » "supply regional integration theorems.", "supply vertical integration theories.", "supply vertical integration theory.", "supply vertical integrationstheorie 2.", "supply partial integration theorems.", "supply political integration theorems.", "supply technical integration theorems."

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: (("supply assets integrating countries.") OR ("supply vertical integration theorems."))~.
• Removing quotes may allow a broader search: (( supply assets integrating countries. ) or ( supply vertical integration theorems. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply assets integrating countries.") or ("supply vertical integration theorems."))*.