Perhaps you should try some spelling variations:
"coder coder models diffusion problem" » "coder coder models diffusion process" (Expand search), "coder coder model diffusive problem" (Expand search), "coder coder node diffusion problem" (Expand search), "coder coder sides diffusion problem" (Expand search), "coder decoder models diffusion problem" (Expand search), "coder poder modelos diffusion problem" (Expand search), "coder order models diffusion problem" (Expand search), "code code models diffusion problem" (Expand search), "decoder codec models diffusion problem" (Expand search)
"_ python python python programming" » "_ pythons python python programming" (Expand search), "_ piton python python programming" (Expand search), "_ pitons 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 coder models diffusion problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder models diffusion problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder models diffusion problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder models diffusion problem") OR ("_ python python python programming"))*.