Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets", "python using java slippers"
"phi hoi khoa snippets" » "phi hoc khoa snippets", "phi noi khoa snippets", "phi tai khoa snippets", "phi loi khoa snippets", "khi hoi khoa snippets", "phi doi khoa snippets", "phi hoi khoa 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: (((("phi hoi khoa snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("phi hoi khoa snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
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