Perhaps you should try some spelling variations:
"dung viet can snippets" » "nang viet can snippets", "cong viet can snippets", "mang viet can snippets", "dung viet van snippets", "dung viet ca snippets", "dung vien can snippets"
"dung java java snippets" » "dung va java snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung viet can snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet can snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets"))*.
• Removing quotes may allow a broader search: (((( dung viet can snippets ) or ( dung java java snippets ))) or ( locating bug code snippets ))*.