Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
interaction series » interactions series, interaction studies, interaction terms
water interaction » matter interaction, layer interaction, matter interactions
vs irrigation » use irrigation, _ irrigation, et irrigation
support vs » support _, support a, support 4

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• Performing a fuzzy search may retrieve terms with similar spellings: (( support vs irrigation schemes. ) or ( supply water interaction series. ))~.
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