Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"sua khoa de snippets" » "chua khoa de snippets", "luan khoa de snippets", "da khoa de snippets", "sua khoa dr snippets", "sua khoa he snippets", "sua khoi de 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: (((("dung java java snippets") or ("sua khoa de snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("sua khoa de snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( sua khoa de snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("sua khoa de snippets"))) or ("locating bug code snippets"))*.