Perhaps you should try some spelling variations:
"supply cost integration theories." » "supply cost integration theorems.", "supply cost integrationstheorie 2.", "supply cost integration theory.", "supply post integration theories.", "supply test integration theories.", "supply about integration theories.", "supply costs integration theories."
"supply diewert integrating services." » "supply diewert integration services.", "supply diewert integrated services.", "supply diewert regulating services.", "supply element integrating services.", "supply event integrating services.", "supply lever integrating services."

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

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