Perhaps you should try some spelling variations:
"using computational python computer program" » "using computacional python computer program" (Expand search), "using computacional vpython computer program" (Expand search), "using computacionais python computer program" (Expand search), "and computational python computer program" (Expand search)
"using diffusion python python programming" » "using diffusion method python programming" (Expand search), "using diffusion paths python programming" (Expand search), "using diffusion photon python programming" (Expand search), "using diffusion pythons python programming" (Expand search), "using diffusion piton python programming" (Expand search), "using diffusion pitons python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("using computational python computer program") OR ("using diffusion python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computational python computer program\") OR (\"using diffusion python python programming\"))".
• Removing quotes may allow a broader search: (( using computational python computer program ) OR ( using diffusion python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computational python computer program") OR ("using diffusion python python programming"))*.