Perhaps you should try some spelling variations:
nutrition requirements » nutritional requirements, nutrient requirements
diffusion diffusion » diffusion perfusion, diffusion interdiffusion
requirements mass » requirement mass, requirements case, requirements main
diffusion linear » diffusion nonlinear, diffusion layer, diffusion like
mass diffusion » gas diffusion

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• Performing a fuzzy search may retrieve terms with similar spellings: nutrition requirements mass diffusion diffusion linear~.
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