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