Perhaps you should try some spelling variations:
"coder _ arduino microcontroller arduino" » "coder _ arduino microcontrolador arduino" (Expand search)
"via python python python programming" » "via pythons python python programming" (Expand search), "via piton python python programming" (Expand search), "via pitons 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: "((\"coder _ arduino microcontroller arduino\") OR (\"via python python python programming\"))~".
• Removing quotes may allow a broader search: (( coder _ arduino microcontroller arduino ) OR ( via python python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("coder _ arduino microcontroller arduino") OR ("via python python python programming"))*.