Perhaps you should try some spelling variations:
"luan van code snippets" » "luan van de snippets", "luan van hoe snippets", "luan van cong snippets", "luan van code slippers", "quan van code snippets", "lan van code snippets"
"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 van 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 van code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung va code snippets ) or ( luan van code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung va code snippets") or ("luan van code snippets"))) or ("locating bug code snippets"))*.