Perhaps you should try some spelling variations:
"coder mode variable diffusion problem" » "coder mode variable diffusivity problem" (Expand search), "coder mode variable diffusion process" (Expand search), "coder modelo variable diffusion problem" (Expand search), "coder one variable diffusion problem" (Expand search), "coder and variable diffusion problem" (Expand search), "under mode variable diffusion problem" (Expand search), "order mode variable diffusion problem" (Expand search), "code code variable diffusion problem" (Expand search)
"api python python python programming" » "api pythons python python programming" (Expand search), "api piton python python programming" (Expand search), "api pitons python python programming" (Expand search), "rpa python 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: (("coder mode variable diffusion problem") OR ("api python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder mode variable diffusion problem\") OR (\"api python python python programming\"))".
• Removing quotes may allow a broader search: (( coder mode variable diffusion problem ) OR ( api python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder mode variable diffusion problem") OR ("api python python python programming"))*.