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 cac dat snippets" » "luong cac dat snippets", "dung cho dat snippets", "dung tai dat snippets", "dung cac dan snippets", "dung cai dat snippets", "dung cac dai snippets", "dung cac 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 cac 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 cac dat snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cong code snippets") or ("dung cac dat snippets"))) or ("locating bug code snippets"))*.