Perhaps you should try some spelling variations:
"supply cost international airports." » "supply cost international airport.", "supply cost international transport.", "supply cost international airshow.", "supply costs international airports.", "supply first international airports.", "supply joint international airports."
"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."

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

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