Perhaps you should try some spelling variations:
"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)
"using pruning in sio2 program" » "using pruning in 2 program" (Expand search), "using pruning in 2012 program" (Expand search), "using pruning in 2002 program" (Expand search), "using pruning and sio2 program" (Expand search), "using running in sio2 program" (Expand search), "using pruning on sio2 program" (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: (("using pruning in sio2 program") OR ("using python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using pruning in sio2 program\") OR (\"using python python python programming\"))".
• Removing quotes may allow a broader search: (( using pruning in sio2 program ) OR ( using python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("using pruning in sio2 program") OR ("using python python python programming"))*.