Perhaps you should try some spelling variations:
"coder optimization based methods problem" » "code optimization based methods problem" (Expand search), "modern optimization based methods problem" (Expand search), "powder optimization based methods problem" (Expand search), "coder optimization and methods problem" (Expand search), "coder optimization based method problems" (Expand search), "coder optimization based methodes problemes" (Expand search), "coder optimization based methods produced" (Expand search), "coder optimization based method problem" (Expand search), "coder optimization mixed methods problem" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking 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 optimization based methods problem\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( coder optimization based methods problem ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder optimization based methods problem") OR ("using coding python python programming"))*.