Perhaps you should try some spelling variations:
"dung vion code snippets" » "dung von code snippets", "dung vien code snippets", "dung van code snippets", "dung vion core snippets"
"dung viet some snippets" » "nang viet some snippets", "cong viet some snippets", "mang viet some snippets", "dung viet song snippets"
"locating bug code snippets" » "locating bug core snippets", "locating bung code snippets", "locating bugs code 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 vion code snippets") or ("dung viet some snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vion code snippets") OR ("dung viet some snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vion code snippets ) or ( dung viet some snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vion code snippets") or ("dung viet some snippets"))) or ("locating bug code snippets"))*.