Perhaps you should try some spelling variations:
"coder coder sample problems problem" » "coder coder sample problemas problem" (Expand search), "coder coder sample problems problems" (Expand search), "coder coder sample problemas problema" (Expand search), "coder coder sample problem problem" (Expand search), "coder coder same problems problem" (Expand search), "coder coder simple problema problem" (Expand search), "coder modern sample problems problem" (Expand search), "coder cover samples problems problem" (Expand search), "coder code samples problems problem" (Expand search), "coder decoder sample problems problem" (Expand search), "code code sample problems problem" (Expand search), "decoder codec sample problems 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 sample problems problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder sample problems problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder sample problems problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder sample problems problem") OR ("on python python python programming"))*.