Perhaps you should try some spelling variations:
"dung nhan code snippets" » "dung luan code snippets", "dung nhan co snippets", "dung nhan con snippets", "dung nhan code slippers"
"trinh va code snippets" » "trinh van code snippets", "trinh vat code snippets", "trinh ve code snippets", "trinh va code slippers"
"locating bug code 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: (((("trinh va code snippets") or ("dung nhan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh va code snippets") OR ("dung nhan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh va code snippets ) or ( dung nhan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh va code snippets") or ("dung nhan code snippets"))) or ("locating bug code snippets"))*.