Perhaps you should try some spelling variations:
"duong dung code snippets" » "cuong dung code snippets", "dung dung code snippets", "duong dang code snippets", "duong dung cong snippets", "duong dung co snippets", "duong dung de snippets", "duong dung code slippers"
"dung hbug code snippets" » "dung hong code snippets", "dung hung code snippets", "dung hbug code slippers", "dung hbung code snippets", "dung hbugs code snippets"
"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 dung code snippets") or ("dung hbug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("duong dung code snippets") OR ("dung hbug code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("duong dung code snippets") or ("dung hbug code snippets"))) or ("locating bug code snippets"))*.