Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"dan viet ly snippets" » "danh viet ly snippets", "san viet ly snippets", "dao viet ly snippets", "dan tiet ly snippets", "dan viet my snippets", "dan viet ty snippets", "dan viet ly 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: (((("dan viet ly snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dan viet ly snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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