Perhaps you should try some spelling variations:
"coder coder teaching doi problem" » "coder code teaching doi problem" (Expand search), "coder poder teaching doi problem" (Expand search), "coder model teaching doi problem" (Expand search), "coder coder teaching deaf problem" (Expand search), "coder decoder teaching doi problem" (Expand search), "code code teaching doi problem" (Expand search), "decoder codec teaching doi problem" (Expand search), "coder coder teaching i problem" (Expand search), "coder coder teaching dois problemas" (Expand search), "coder coder teaching robin 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 teaching doi problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder teaching doi problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder teaching doi problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder teaching doi problem") OR ("on python python python programming"))*.