Perhaps you should try some spelling variations:
"supply curve integration theories." » "supply curve integration theorems.", "supply curve integrationstheorie 2.", "supply curve integration theory.", "supply care integration theories.", "supply burke integration theories.", "supply curvello integration theories."
"supply fare interaction terms." » "supply fare interaction term.", "supply face interaction terms.", "supply face interactions terms.", "supply fare integration terms.", "supply farm interaction terms.", "supply case interaction terms.", "supply figure interaction terms."

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• Performing a fuzzy search may retrieve terms with similar spellings: (("supply curve integration theories.") or ("supply fare interaction terms."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply curve integration theories.") OR ("supply fare interaction terms."))*.
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