Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"dung ha de snippets" » "dung va de snippets", "dung he de snippets", "dung khoa de snippets", "dung hac de snippets", "dung hat de 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: (((("dung ha de snippets") or ("python missing data snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung ha de snippets") OR ("python missing data snippets"))) OR ("locating bug code snippets")).
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