Perhaps you should try some spelling variations:
"using computation using diffusion problem" » "using computational using diffusion problem" (Expand search), "using imputation using diffusion problem" (Expand search), "using compilation using diffusion problem" (Expand search), "using computations using diffusion problem" (Expand search), "using computation in diffusion problem" (Expand search), "using composition using diffusion problem" (Expand search), "using computation using diffusion process" (Expand search)
"using codigo python python programming" » "using codigo pythons python programming" (Expand search), "using codigo piton python programming" (Expand search), "using codigo pitons python programming" (Expand search), "using indigo python python programming" (Expand search), "using coding python python programming" (Expand search), "using codium python 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 computation using diffusion problem") OR ("using codigo python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using computation using diffusion problem\") OR (\"using codigo python python programming\"))".
• Removing quotes may allow a broader search: (( using computation using diffusion problem ) OR ( using codigo python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using computation using diffusion problem") OR ("using codigo python python programming"))*.