Perhaps you should try some spelling variations:
"and computational using diffusion program" » "and computation using diffusion program" (Expand search), "and computations using diffusion program" (Expand search), "and computacional usinas diffusion program" (Expand search), "_ computational using diffusion program" (Expand search), "and computational using diffusion problem" (Expand search), "and computational using diffusion problems" (Expand search), "and computational using diffusion process" (Expand search)
"using tool python python programming" » "using tool pythons python programming" (Expand search), "using tool piton python programming" (Expand search), "using tool pitons python programming" (Expand search), "using tools python python programming" (Expand search), "using total python python programming" (Expand search), "using tonal python python programming" (Expand search)

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• Removing quotes may allow a broader search: (( and computational using diffusion program ) OR ( using tool python python programming ))*.