Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi dau doi snippets" » "khoan dau doi snippets", "hoi dap doi snippets", "hoi dan doi snippets", "khoi cau doi snippets", "khoi dau noi snippets", "khoi dau do snippets"
"locating bug code snippets" » "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: (((("khoi dau doi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khoi dau doi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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