Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"han cac nhan snippets" » "han ca nhan snippets", "han cac nha snippets", "han cam nhan snippets", "phan cac nhan snippets", "hang cac nhan snippets", "hanh cac nhan snippets", "han cac nhan 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: (((("han cac nhan snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("han cac nhan snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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