Perhaps you should try some spelling variations:
"using computational arc routing problem" » "and computational arc routing problem" (Expand search), "using computational art routing problem" (Expand search), "using computational and routing problem" (Expand search), "using computational search routing problem" (Expand search), "using computational arc routine problem" (Expand search), "using computational arc routines 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: "((\"using computational arc routing problem\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( using computational arc routing problem ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using computational arc routing problem") OR ("using coding python python programming"))*.