Perhaps you should try some spelling variations:
"phan chung code snippets" » "phan cung code snippets", "phan hung code snippets", "phan thuong code snippets", "phan chung co snippets", "phan chung code slippers"
"dung phan code snippets" » "dung nhan code snippets", "dung luan code snippets", "dung ha code snippets", "dung phan cong snippets", "dung phan co snippets", "dung phan che snippets", "dung phan 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("phan chung code snippets") or ("dung phan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phan chung code snippets") OR ("dung phan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan chung code snippets ) or ( dung phan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan chung code snippets") or ("dung phan code snippets"))) or ("locating bug code snippets"))*.