Perhaps you should try some spelling variations:
"dipole transitions integration schemes." » "dipole transitions international schemes.", "dipole organizations integration schemes.", "dipole acquisitions integration schemes.", "dipole transitions integration schengen.", "dipole transitions irrigation schemes.", "dipole transitions integration regimes.", "role transitions integration schemes.", "die transition integration schemes.", "do transitions integration schemes."
"support crop irrigation scheme." » "support crop irrigation systems.", "support drip irrigation scheme.", "support scale irrigation scheme.", "support canal irrigation scheme.", "support crops irrigation scheme.", "support cross irrigation scheme.", "support across irrigation scheme."

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("support crop irrigation scheme.") OR ("dipole transitions integration schemes."))~.
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