Perhaps you should try some spelling variations:
"supply mexican integration theories." » "supply mexican integration theorems.", "supply mexican integrationstheorie 2.", "supply mexican integration theory.", "supply american integration theories.", "supply mexico integration theories.", "supply mexico's integration theories."
"supply side integration regimes." » "supply side immigration regimes.", "supply side international regimes.", "supply side integration regional.", "supply die integration regimes.", "supply de integration regimes.", "supply life integration regimes."

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 side integration regimes.") OR ("supply mexican integration theories."))~.
• Removing quotes may allow a broader search: (( supply side integration regimes. ) or ( supply mexican integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply side integration regimes.") or ("supply mexican integration theories."))*.