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