Perhaps you should try some spelling variations:
"supply china immigration policies." » "supply china immigration policy.", "supply china migration policy.", "supply china integration policies.", "supply child migration policies.", "supply national immigration policies.", "supply chains immigration policies.", "supply chain immigration policies."
"supply costs integration series." » "supply costs integration theories.", "supply costs integrating services.", "supply costs integration schemes.", "supply south integration series.", "supply systems integration series.", "supply content integration series."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply china immigration policies.") OR ("supply costs integration series."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply china immigration policies.\") OR (\"supply costs integration series.\"))".
• Removing quotes may allow a broader search: (( supply china immigration policies. ) OR ( supply costs integration series. )).
• Adding a wildcard symbol may retrieve word variants: (("supply china immigration policies.") OR ("supply costs integration series."))*.