Perhaps you should try some spelling variations:
"coder coder course planning problem" » "coder coder course packing problem" (Expand search), "coder coder course planning process" (Expand search), "coder coder use planning problem" (Expand search), "coder coder care planning problem" (Expand search), "coder coder resource planning problem" (Expand search), "coder lower course planning problem" (Expand search), "coder borders course planning problem" (Expand search), "coder milder course planning problem" (Expand search), "coder decoder course planning problem" (Expand search), "code code course planning problem" (Expand search), "decoder codec course planning 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 course planning problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder course planning problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder course planning problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder course planning problem") OR ("on python python python programming"))*.