Perhaps you should try some spelling variations:
"duong dang code snippets" » "dung dang code snippets", "duong dan code snippets", "duong dung code snippets", "duong dang cong snippets", "duong dang co snippets", "duong dang de snippets", "duong dang code slippers"
"dung cong java snippets" » "dung trong java snippets", "dung cong va snippets", "dung cong java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

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