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 ppnhanhh code snippets" » "dung ppnphanhh code snippets", "dung ppnnhanhh code snippets", "dung ppnhanhhh code snippets", "dung ppnhanhh core snippets", "dung ppnhanhh 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 ppnhanhh 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 ppnhanhh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han 2 code snippets ) or ( dung ppnhanhh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han 2 code snippets") or ("dung ppnhanhh code snippets"))) or ("locating bug code snippets"))*.