Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dau len con snippets" » "dam len con snippets", "dau tien con snippets", "dau luan con snippets", "dau len cong snippets", "dau lon con snippets", "dau le con 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 ("dau len con snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung java java snippets") OR ("dau len con snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung java java snippets ) or ( dau len con snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung java java snippets") or ("dau len con snippets"))) or ("locating bug code snippets"))*.