החיפוש שביצעת - "((information requirements) OR (irrigation requirements)) regarding sanitation concepts critiques" - חזר ריק.

אולי כדאי לנסות איות אחר או כתיב מלא:
information requirements » nutrition requirements, information environments
irrigation requirements » irrigation equipment, nutrition requirements
regarding sanitation » regarding organization, separating sanitation, regarding conation
sanitation concepts » animation concepts, organization concepts, organisation concepts
concepts critiques » concepts critical

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