Perhaps you should try some spelling variations:
"code of arduino microcontroller arduino" » "code of arduino microcontrolador arduino" (Expand search), "code _ arduino microcontroller arduino" (Expand search), "code an arduino microcontroller arduino" (Expand search)
"of python python python programming" » "of pythons python python programming" (Expand search), "of piton python python programming" (Expand search), "of pitons python python programming" (Expand search), "_ 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: (("code of arduino microcontroller arduino") OR ("of python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"code of arduino microcontroller arduino\") OR (\"of python python python programming\"))".
• Removing quotes may allow a broader search: (( code of arduino microcontroller arduino ) OR ( of python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("code of arduino microcontroller arduino") OR ("of python python python programming"))*.