Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"khoa toan va snippets" » "khoa than va snippets", "hoa toan va snippets", "khoa luan va snippets", "khoa doan va snippets", "khoa tran van snippets", "khoa toan ban snippets", "khoa toan va 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: (((("khoa toan va snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoa toan va snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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