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