Perhaps you should try some spelling variations:
"and expression using integer programming" » "and expression using linear programming" (Expand search), "and expression during integer programming" (Expand search), "and expression and integer programming" (Expand search), "and expression using inter programming" (Expand search), "and expression using internet programming" (Expand search), "and expression using integral programming" (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: (("and expression using integer programming") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"and expression using integer programming\") OR (\"using python python python programming\"))".
• Removing quotes may allow a broader search: (( and expression using integer programming ) OR ( using python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("and expression using integer programming") OR ("using python python python programming"))*.