Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"dat hieu cac snippets" » "dao hieu cac snippets", "dat tieu cac snippets", "rat nhieu cac snippets", "dat hieu luc snippets", "dat hieu va snippets", "dat hieu van 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: (((("dat hieu cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dat hieu cac snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dat hieu cac snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dat hieu cac snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.