Perhaps you should try some spelling variations:
"coder coder reading propositional problem" » "coder coder extending propositional problem" (Expand search), "coder coder among propositional problem" (Expand search), "coder coder realismo proposicional problem" (Expand search), "coder modern reading propositional problem" (Expand search), "coder model reading propositional problem" (Expand search), "coder over reading propositional problem" (Expand search), "coder decoder reading propositional problem" (Expand search), "code code reading propositional problem" (Expand search), "decoder codec reading propositional 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)

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• Performing a fuzzy search may retrieve terms with similar spellings: (("coder coder reading propositional problem") OR ("on python python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"coder coder reading propositional problem\") OR (\"on python python python programming\"))".
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• Adding a wildcard symbol may retrieve word variants: (("coder coder reading propositional problem") OR ("on python python python programming"))*.