Perhaps you should try some spelling variations:
"based computational _ string problem" » "and computational _ string problem" (Expand search), "by computational _ string problem" (Expand search), "based computational _ sizing problem" (Expand search), "based computational _ rostering problem" (Expand search), "based computational _ sharing problems" (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 computational _ string problem") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"based computational _ string problem\") OR (\"using python python python programming\"))".
• Removing quotes may allow a broader search: (( based computational _ string problem ) OR ( using python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("based computational _ string problem") OR ("using python python python programming"))*.