Perhaps you should try some spelling variations:
"using python python arduino programmable" » "using pythons python arduino programmable" (Expand search), "using piton python arduino programmable" (Expand search), "using pitons python arduino programmable" (Expand search), "usando python python arduino programmable" (Expand search), "in python python arduino programmable" (Expand search)
"pruning and python python programming" » "pruning and pythons python programming" (Expand search), "pruning and piton python programming" (Expand search), "pruning and pitons python programming" (Expand search), "pruning in python python programming" (Expand search), "pruning on python python programming" (Expand search), "pruning api 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 python python arduino programmable\") OR (\"pruning and python python programming\"))~".
• Removing quotes may allow a broader search: (( using python python arduino programmable ) OR ( pruning and python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using python python arduino programmable") OR ("pruning and python python programming"))*.