Perhaps you should try some spelling variations:
"coder coder agar diffusion problem" » "coder coder agar diffusion process" (Expand search), "coder coder and diffusion problem" (Expand search), "coder decoder agar diffusion problem" (Expand search), "code code agar diffusion problem" (Expand search), "decoder codec agar 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder agar diffusion problem\") OR (\"_ python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder coder agar diffusion problem ) OR ( _ python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder coder agar diffusion problem") OR ("_ python python python programming"))*.