Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"van nhan wen snippets" » "van phan wen snippets", "van thanh wen snippets", "danh nhan wen snippets", "van nhan gen snippets", "van nhan vien snippets", "van nhan dien snippets", "van nhan wen 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: (((("van nhan wen snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("van nhan wen snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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