Perhaps you should try some spelling variations:
"supply chain integration theories." » "supply chain integration theory.", "supply chain integration through.", "supply chain integration efforts.", "supply trade integration theories.", "supply data integration theories.", "supply grid integration theories."
"supply shock testing services." » "supply shock lending services.", "supply shock training services.", "supply shock banking services.", "supply soil testing services.", "supply home testing services.", "supply how testing services.", "supply shocks 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 chain integration theories.\") OR (\"supply shock testing services.\"))~".
• Removing quotes may allow a broader search: (( supply chain integration theories. ) OR ( supply shock testing services. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply chain integration theories.") OR ("supply shock testing services."))*.