Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"hoat doi dan snippets" » "hoa doi dan snippets", "hat doi dan snippets", "hoat dong dan snippets", "hoat hoi dan snippets", "hoat doi ban snippets", "hoat doi dau snippets", "hoat 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: (((("hoat 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: (((("hoat doi dan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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