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