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