Perhaps you should try some spelling variations:
"dung cong code snippets" » "dung trong code snippets", "dung cong cong snippets", "dung cong co snippets", "dung cong che snippets", "dung cong code slippers"
"dung hoi dat snippets" » "duong hoi dat snippets", "dung hoai dat snippets", "dung thoi dat snippets", "dung hoi dap snippets", "dung hoi dan snippets", "dung hoc dat snippets", "dung hoi dat 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: (((("dung cong code snippets") or ("dung hoi dat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cong code snippets") OR ("dung hoi dat snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cong code snippets ) or ( dung hoi dat snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cong code snippets") or ("dung hoi dat snippets"))) or ("locating bug code snippets"))*.