Perhaps you should try some spelling variations:
"supply mass immigration policies." » "supply mass immigration policy.", "supply mass migration policy.", "supply mass migration policies.", "supply _ immigration policies.", "supply case immigration policies.", "supply main immigration policies.", "supply many immigration policies."
"supply can integration process." » "supply can reintegration process.", "supply can migration process.", "supply can innovation process.", "supply chain integration process.", "supply von integration process.", "supply urban integration process.", "supply case integration process.", "supply chai integration process."

Try widening your search to All Fields.

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

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