Perhaps you should try some spelling variations:
"supply de integration theories." » "supply de integration theorems.", "supply de integrationstheorie 2.", "supply de integration theory.", "supply die integration theories.", "supply re integration theories.", "supply une integration theories.", "supply _ integration theories.", "supply a integration theories.", "supply 3 integration theories."
"supply side integration schemes." » "supply side integration schengen.", "supply side irrigation schemes.", "supply side integration regimes.", "supply die integration schemes.", "supply life integration schemes.", "supply eine integration schemes.", "supply sidie integration schemes.", "supply sire integration schemes.", "supply siune integration schemes."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply de integration theories.") OR ("supply side integration schemes."))~.
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