Perhaps you should try some spelling variations:
"locating bug core snippets" » "locating bug code snippets"
"dung viet can snippets" » "dung viet code 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"

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 viet can snippets") or ("dung java java snippets"))) or ("locating bug core 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 core snippets")).
• Removing quotes may allow a broader search: (((( dung viet can snippets ) or ( dung java java snippets ))) or ( locating bug core snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet can snippets") or ("dung java java snippets"))) or ("locating bug core snippets"))*.