Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"thi toan o snippets" » "thi toan code snippets", "thi tran o snippets", "thi hoan o snippets", "thi loan o snippets", "thi toan ho snippets", "thi toan co snippets", "thi toan do snippets"

Try widening your search to All Fields.

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