Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"thoi dai o snippets" » "thoi dai code snippets", "hoc dai o snippets", "hoi dap o snippets", "hoi dan o snippets", "thoi dai so snippets", "thoi dao o snippets", "thoi dai 2 snippets"

Try widening your search to All Fields.

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