Perhaps you should try some spelling variations:
"by computational using invariant problem" » "by computation using invariant problem" (Expand search), "by computations using invariant problem" (Expand search), "by computacional usinas invariant problem" (Expand search), "by computational using variance problem" (Expand search), "by computational using invariant triplet" (Expand search), "_ computational using invariant problem" (Expand search), "and computational using invariant 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.

• Performing a fuzzy search may retrieve terms with similar spellings: (("by computational using invariant problem") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"by computational using invariant problem\") OR (\"using coding python python programming\"))".
• Removing quotes may allow a broader search: (( by computational using invariant problem ) OR ( using coding python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("by computational using invariant problem") OR ("using coding python python programming"))*.