Perhaps you should try some spelling variations:
"hanh luat code snippets" » "nganh luat code snippets", "hang luan code snippets", "hanh lam code snippets", "hanh luat cong snippets", "hanh luat de snippets", "hanh luat 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: (((("hanh luat 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: (((("hanh luat code snippets") OR ("dung phan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hanh luat code snippets ) or ( dung phan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hanh luat code snippets") or ("dung phan code snippets"))) or ("locating bug code snippets"))*.