Perhaps you should try some spelling variations:
"based computation and routing problem" » "based computational and routing problem" (Expand search), "based competition and routing problem" (Expand search), "based compilation and routing problem" (Expand search), "based computation of routing problem" (Expand search), "based computation arc routing problem" (Expand search)
"using codigo python python programming" » "using codigo pythons python programming" (Expand search), "using codigo piton python programming" (Expand search), "using codigo pitons python programming" (Expand search), "using indigo python python programming" (Expand search), "using coding python python programming" (Expand search), "using codium python python programming" (Expand search)

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based computation and routing problem\") OR (\"using codigo python python programming\"))~".
• Removing quotes may allow a broader search: (( based computation and routing problem ) OR ( using codigo python python programming ))~.
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