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