Perhaps you should try some spelling variations:
"supply trade integration theorems." » "supply trade integration theories.", "supply trade integration theory.", "supply trade integrationstheorie 2.", "supply case integration theorems."
"support border integration policies." » "support border immigration policies.", "support border international policies.", "support border migration policies.", "support der integration policies.", "support merger integration policies.", "support better integration policies.", "support gender integration policies.", "support modern integration policies."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply trade integration theorems.") or ("support border integration policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply trade integration theorems.") OR ("support border integration policies."))*.
• Removing quotes may allow a broader search: (( supply trade integration theorems. ) or ( support border integration policies. ))*.