Perhaps you should try some spelling variations:
"coder coder learning posed problems" » "coder codes learning posed problems" (Expand search), "coder modern learning posed problems" (Expand search), "coder model learning posed problems" (Expand search), "coder coder learning closed problems" (Expand search), "coder coder learning post problems" (Expand search), "coder coder learning proposed problems" (Expand search), "coder coder learning old problems" (Expand search), "coder coder learning coupled problems" (Expand search), "coder decoder learning posed problems" (Expand search), "code code learning posed problems" (Expand search), "decoder codec learning posed 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 learning posed problems") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder learning posed problems\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder learning posed problems ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder learning posed problems") OR ("on python python python programming"))*.