Perhaps you should try some spelling variations:
"coder coder computer optics problem" » "coder coder computer office problem" (Expand search), "coder coder computer graphics problem" (Expand search), "coder coder computer devices problem" (Expand search), "coder model computer optics problem" (Expand search), "coder node computer optics problem" (Expand search), "coder color computer optics problem" (Expand search), "coder coder computer robotics problem" (Expand search), "coder coder computer optimal problem" (Expand search), "coder decoder computer optics problem" (Expand search), "code code computer optics problem" (Expand search), "decoder codec computer optics problem" (Expand search)
"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)

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 computer optics problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder computer optics problem\") OR (\"on python python python programming\"))*".
• Removing quotes may allow a broader search: (( coder coder computer optics problem ) OR ( on python python python programming ))*.