Perhaps you should try some spelling variations:
"on python python python programming" » "on pythons python python programming" (Expand search), "on piton python python programming" (Expand search), "on pitons python python programming" (Expand search), "in python pythin python programming" (Expand search), "of python pythof python programming" (Expand search), "_ python pyth_ python programming" (Expand search)
"coder coder robo arduino programmable" » "coder coder robots arduino programmable" (Expand search), "coder coder brito arduino programmable" (Expand search), "coder coder of arduino programmable" (Expand search), "coder decoder robo arduino programmable" (Expand search), "code code robo arduino programmable" (Expand search), "decoder codec robo arduino programmable" (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: (("coder coder robo arduino programmable") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder robo arduino programmable\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder robo arduino programmable ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder robo arduino programmable") OR ("on python python python programming"))*.