Perhaps you should try some spelling variations:
"cong viet data snippets" » "cong viec data snippets", "thong viet data snippets", "nang viet data snippets", "cong viet dat snippets", "cong viet ta snippets", "cong lieu data snippets", "cong 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 ("cong 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 ("cong viet data snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung va code snippets ) or ( cong viet data snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung va code snippets") or ("cong viet data snippets"))) or ("locating bug code snippets"))*.