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 knnphanhg code snippets" » "dung knnpphanhg code snippets", "dung knnpnhanhg code snippets", "dung knnphanhhg code snippets", "dung knnphanhg core snippets", "dung knnphanhg 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("han 2 code snippets") or ("dung knnphanhg 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 knnphanhg code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( han 2 code snippets ) or ( dung knnphanhg code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("han 2 code snippets") or ("dung knnphanhg code snippets"))) or ("locating bug code snippets"))*.