Perhaps you should try some spelling variations:
"duong dung deu snippets" » "cuong dung deu snippets", "dung dung deu snippets", "duong dang deu snippets", "duong dung de snippets", "duong dung du snippets", "duong dung dau snippets"
"dang java java snippets" » "dang va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core 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: (((("dang java java snippets") or ("duong dung deu snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dang java java snippets") OR ("duong dung deu snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dang java java snippets ) or ( duong dung deu snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dang java java snippets") or ("duong dung deu snippets"))) or ("locating bug code snippets"))*.