Perhaps you should try some spelling variations:
"coder implementation doi coding problem" » "code implementation doi coding problem" (Expand search), "decoder implementation doi coding problem" (Expand search), "model implementation doi coding problem" (Expand search), "coder implementation fodi coding problem" (Expand search), "coder implementation of coding problem" (Expand search), "coder implementation on coding problem" (Expand search), "coder implementation doi coding problems" (Expand search), "coder implementation doi coping problem" (Expand search), "coder implementation doi loading problem" (Expand search), "coder implementation doi codi problem" (Expand search)
"python using python python programming" » "python using pythons python programming" (Expand search), "python using piton python programming" (Expand search), "python using pitons python programming" (Expand search), "python usando python python programming" (Expand search), "python coding python python programming" (Expand search), "action using python python programming" (Expand search), "python in 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 implementation doi coding problem\") OR (\"python using python python programming\"))~".
• Removing quotes may allow a broader search: (( coder implementation doi coding problem ) OR ( python using python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder implementation doi coding problem") OR ("python using python python programming"))*.