Perhaps you should try some spelling variations:
"duong cong code snippets" » "luong cong code snippets", "duong trong code snippets", "trong cong code snippets", "duong cong cong snippets", "duong cong co snippets", "duong cong che snippets", "duong cong code slippers"
"dung cong code snippets" » "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung trong code snippets", "dung cong code slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("duong cong code snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong cong code snippets") OR ("dung cong code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( duong cong code snippets ) or ( dung cong code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("duong cong code snippets") or ("dung cong code snippets"))) or ("locating bug code snippets"))*.