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