Perhaps you should try some spelling variations:
"and computation and string problem" » "and computational and string problem" (Expand search), "of computation and string problem" (Expand search), "and computation of string problem" (Expand search), "and computation and sizing problem" (Expand search), "and computation and rostering problem" (Expand search), "and computation and sharing problems" (Expand search), "and computation and strong problem" (Expand search), "and computation and sharing problem" (Expand search), "and computation and staging 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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and computation and string problem\") OR (\"using python python python programming\"))~".
• Removing quotes may allow a broader search: (( and computation and string problem ) OR ( using python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("and computation and string problem") OR ("using python python python programming"))*.