Perhaps you should try some spelling variations:
"coder python computation tree problem" » "coder method computation tree problem" (Expand search), "coder on computation tree problem" (Expand search), "coder python computation the problem" (Expand search), "coder python computation to problem" (Expand search), "coder python computation from problem" (Expand search), "compra python computation tree 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)

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 python computation tree problem\") OR (\"using codigo python python programming\"))~".
• Removing quotes may allow a broader search: (( coder python computation tree problem ) OR ( using codigo python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder python computation tree problem") OR ("using codigo python python programming"))*.