Perhaps you should try some spelling variations:
"coder coder coupling smith problem" » "coder mode coupling smith problem" (Expand search), "coder model coupling smith problem" (Expand search), "coder core coupling smith problem" (Expand search), "coder coder coupling with problem" (Expand search), "coder coder coupling shifts problem" (Expand search), "coder coder couplings with problem" (Expand search), "coder coder coupling path problem" (Expand search), "coder coder coupling with problems" (Expand search), "coder decoder coupling smith problem" (Expand search), "code code coupling smith problem" (Expand search), "decoder codec coupling smith 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 coupling smith problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder coupling smith problem\") OR (\"on python python python programming\"))".
• Removing quotes may allow a broader search: (( coder coder coupling smith problem ) OR ( on python python python programming )).
• Adding a wildcard symbol may retrieve word variants: (("coder coder coupling smith problem") OR ("on python python python programming"))*.