Perhaps you should try some spelling variations:
"and computational using clustering problem" » "and computation using clustering problem" (Expand search), "and computations using clustering problem" (Expand search), "and computacional usinas clustering problem" (Expand search), "and computational using covering problem" (Expand search), "_ computational using clustering problem" (Expand search), "and computational and clustering problem" (Expand search), "and computational means clustering problem" (Expand search)
"using on python python programming" » "using on pythons python programming" (Expand search), "using on piton python programming" (Expand search), "using on pitons python programming" (Expand search), "using in python python programming" (Expand search), "using of python python programming" (Expand search), "using _ python python programming" (Expand search), "using open python python programming" (Expand search), "using only 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: (("and computational using clustering problem") OR ("using on python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computational using clustering problem\") OR (\"using on python python programming\"))".
• Removing quotes may allow a broader search: (( and computational using clustering problem ) OR ( using on python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and computational using clustering problem") OR ("using on python python programming"))*.