Perhaps you should try some spelling variations:
"and computational using ranking problems" » "and computation using ranking problems" (Expand search), "and computations using ranking problems" (Expand search), "and computacional usinas ranking problems" (Expand search), "_ computational using ranking problems" (Expand search), "and computational using ranking problem" (Expand search), "and computational using banking problems" (Expand search), "and computational using drinking problems" (Expand search), "and computational using stacking problems" (Expand search), "and computational using resting problems" (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: "((\"and computational using ranking problems\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( and computational using ranking problems ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("and computational using ranking problems") OR ("using coding python python programming"))*.