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