Perhaps you should try some spelling variations:
"han 2 code snippets" » "phan 2 code snippets", "nhan 2 code snippets", "hanh 2 code snippets", "han 2 core snippets", "han 2 code slippers"
"dung npnphanhh code snippets" » "dung npnpphanhh code snippets", "dung npnpnhanhh code snippets", "dung npnphanhhh code snippets", "dung npnphanhh core snippets", "dung npnphanhh 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: (((("han 2 code snippets") or ("dung npnphanhh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han 2 code snippets") OR ("dung npnphanhh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han 2 code snippets ) or ( dung npnphanhh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han 2 code snippets") or ("dung npnphanhh code snippets"))) or ("locating bug code snippets"))*.