Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"ngu doi dan snippets" » "neu doi dan snippets", "ngu noi dan snippets", "nu doi dan snippets", "ngu hoi dan snippets", "ngu doi ban snippets", "ngu doi dau snippets", "ngu doi dan slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("ngu doi dan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("ngu doi dan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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