Perhaps you should try some spelling variations:
"supply china immigration policies." » "supply china immigration policy.", "supply china migration policy.", "supply china migration policies.", "supply chinese immigration policies.", "supply china integration policies.", "supply chains immigration policies.", "supply chain immigration policies."
"supply soil testing services." » "supply soil existing services.", "supply soil lending services.", "supply soil training services.", "supply model testing services.", "supply social testing services.", "supply school testing services.", "supply soviet testing services."

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply soil testing services.\") OR (\"supply china immigration policies.\"))~".
• Removing quotes may allow a broader search: (( supply soil testing services. ) OR ( supply china immigration policies. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply soil testing services.") OR ("supply china immigration policies."))*.