Perhaps you should try some spelling variations:
"coder coder green sample problem" » "coder coder green complex problem" (Expand search), "coder coder green scale problem" (Expand search), "coder coder green apple problem" (Expand search), "coder coder driven sample problem" (Expand search), "coder coder green supply problem" (Expand search), "coder decoder green sample problem" (Expand search), "code code green sample problem" (Expand search), "decoder codec green sample problem" (Expand search), "coder cover green sample problem" (Expand search), "coder copper green sample problem" (Expand search), "coder powder green sample 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 green sample problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder green sample problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder green sample problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder green sample problem") OR ("on python python python programming"))*.