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