Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"danh cho de snippets" » "danh cho he snippets", "danh cao de snippets", "danh cho xe snippets", "doanh cho de snippets", "dan cho de snippets", "dinh cho 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: (((("danh cho de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh cho de snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( danh cho de snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("danh cho de snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.