Perhaps you should try some spelling variations:
"supply post interaction terms." » "supply post interaction term.", "supply host interaction terms.", "supply host interactions terms.", "supply post integration terms.", "supply cost interaction terms.", "supply costs interaction terms.", "supply 21st interaction terms."
"supply crisis motivation theory." » "supply thesis motivation theory.", "supply crisis situation theory.", "supply groups motivation theory.", "supply crisis motivation der.", "supply crisis innovation theory.", "supply costs motivation theory.", "supply credit motivation theory.", "supply rise motivation theory."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply post interaction terms.") OR ("supply crisis motivation theory.")).
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