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