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