Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"danh tu ho snippets" » "danh tu code snippets", "anh tu ho snippets", "hanh tu ho snippets", "doanh thu ho snippets", "danh tu hoc snippets", "danh tu hoa snippets", "danh tu hon snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("danh tu ho snippets") or ("python missing data snippets"))) or ("locating bug core snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("danh tu ho snippets") OR ("python missing data snippets"))) OR ("locating bug core snippets")).
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