Perhaps you should try some spelling variations:
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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"using mutation code coding program\") OR (\"using combinations from integer programming\"))~".
• Removing quotes may allow a broader search: (( using mutation code coding program ) OR ( using combinations from integer programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("using mutation code coding program") OR ("using combinations from integer programming"))*.