Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"da tu hon snippets" » "da tu code snippets", "da tu chon snippets", "da tuc hon snippets", "da tu hoc snippets", "dau tu hon snippets", "dan tu hon snippets", "dai tu hon snippets"

Try widening your search to All Fields.

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