Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"thu va tin snippets" » "thuc va tin snippets", "thue va tin snippets", "tu va tin snippets", "thu va tinh snippets", "thu van tin snippets", "thu va tieng snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("thu va tin snippets") or ("python missing data snippets"))) or ("locating bug core snippets"))~.
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