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