Perhaps you should try some spelling variations:
"using computation and testing problems" » "using computational and testing problems" (Expand search), "using imputation and testing problems" (Expand search), "using compilation and testing problems" (Expand search), "using computation and nesting problems" (Expand search), "using computation and testing problem" (Expand search), "using computation and treating problems" (Expand search), "using computation of testing problems" (Expand search), "using computation and teaching 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.

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