Perhaps you should try some spelling variations:
"python missing data snippets" » "python using data snippets"
"locating bug core snippets" » "locating bug code snippets"
"khu tu tin snippets" » "thu tu tin snippets", "chu tu tin snippets", "khu du tin snippets", "khu thu tin snippets", "khu tu tieng snippets", "khu tru tinh snippets"

Try widening your search to All Fields.

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