Perhaps you should try some spelling variations:
"coder implementation model doi problem" » "code implementation model doi problem" (Expand search), "decoder implementation model doi problem" (Expand search), "model implementation model doi problem" (Expand search), "coder implementation of doi problem" (Expand search), "coder implementation and doi problem" (Expand search), "coder implementation on doi problem" (Expand search), "coder implementation model i problem" (Expand search), "coder implementation model dois problemas" (Expand search), "coder implementation model robin problem" (Expand search), "coder implementation model dem problem" (Expand search)
"python coding python python programming" » "action coding python python programming" (Expand search), "python code python python programming" (Expand search), "python codigo python python programming" (Expand search), "python codigos python python programming" (Expand search), "python using python python programming" (Expand search), "python coding pythons python programming" (Expand search), "python coding piton python programming" (Expand search), "python coding pitons 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 implementation model doi problem") OR ("python coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder implementation model doi problem\") OR (\"python coding python python programming\"))".
• Removing quotes may allow a broader search: (( coder implementation model doi problem ) OR ( python coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder implementation model doi problem") OR ("python coding python python programming"))*.