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