Perhaps you should try some spelling variations:
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• Performing a fuzzy search may retrieve terms with similar spellings: (("teaching propositions and java programming") OR ("using coding python python programming"))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"teaching propositions and java programming\") OR (\"using coding python python programming\"))".
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• Adding a wildcard symbol may retrieve word variants: (("teaching propositions and java programming") OR ("using coding python python programming"))*.