Perhaps you should try some spelling variations:
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"variable diffusion on coding programming" » "variable diffusivity on coding programming" (Expand search), "variable diffusion on solving programming" (Expand search), "variable diffusion on cone programming" (Expand search), "variable diffusion on conic programming" (Expand search), "variable diffusion of coding programming" (Expand search), "variable diffusion in coding programming" (Expand search), "variable diffusion and coding programming" (Expand search), "variable diffusion non coding 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: (("variable diffusion on coding programming") OR ("advanced python python computer programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"variable diffusion on coding programming\") OR (\"advanced python python computer programming\"))*".
• Removing quotes may allow a broader search: (( variable diffusion on coding programming ) OR ( advanced python python computer programming ))*.