Perhaps you should try some spelling variations:
"coder coder type diffusion problem" » "coder coder type diffusion process" (Expand search), "coder coder the diffusion problem" (Expand search), "coder coder state diffusion problem" (Expand search), "coder decoder type diffusion problem" (Expand search), "code code type diffusion problem" (Expand search), "decoder codec type diffusion problem" (Expand search), "coder cover type diffusion problem" (Expand search), "coder code type diffusion problem" (Expand search), "coder modern type 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 type diffusion problem") OR ("_ python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder type diffusion problem\") OR (\"_ python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder type diffusion problem ) OR ( _ python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder type diffusion problem") OR ("_ python python python programming"))*.