Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"moi duc hoan snippets" » "moi duc hoang snippets", "moi duc hoa snippets", "moi duc toan snippets", "mai duc hoan snippets", "oi duc hoan snippets", "hoai duc hoan snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("moi duc hoan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("moi duc hoan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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